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https://git.videolan.org/git/ffmpeg.git
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252 lines
6.3 KiB
C
252 lines
6.3 KiB
C
![]() |
/*
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* BMP image format
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* Copyright (c) 2005 Mans Rullgard
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avcodec.h"
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#include "bitstream.h"
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#include "bswap.h"
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typedef struct BMPContext {
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AVFrame picture;
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} BMPContext;
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#define BMP_RGB 0
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#define BMP_RLE8 1
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#define BMP_RLE4 2
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#define BMP_BITFIELDS 3
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#define read16(bits) bswap_16(get_bits(bits, 16))
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#define read32(bits) bswap_32(get_bits_long(bits, 32))
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static 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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uint8_t *buf, int buf_size)
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{
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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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GetBitContext bits;
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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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unsigned int 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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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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init_get_bits(&bits, buf, buf_size);
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if(get_bits(&bits, 16) != 0x424d){ /* 'BM' */
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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 = read32(&bits);
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if(buf_size < fsize){
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av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
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buf_size, fsize);
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return -1;
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}
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skip_bits(&bits, 16); /* reserved1 */
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skip_bits(&bits, 16); /* reserved2 */
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hsize = read32(&bits); /* header size */
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if(fsize <= hsize){
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av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
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fsize, hsize);
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return -1;
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}
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ihsize = read32(&bits); /* 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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width = read32(&bits);
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height = read32(&bits);
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if(read16(&bits) != 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 = read16(&bits);
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if(ihsize > 16)
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comp = read32(&bits);
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else
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comp = BMP_RGB;
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if(comp != BMP_RGB && comp != BMP_BITFIELDS){
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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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skip_bits(&bits, 20 * 8);
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rgb[0] = read32(&bits);
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rgb[1] = read32(&bits);
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rgb[2] = read32(&bits);
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}
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avctx->codec_id = CODEC_ID_BMP;
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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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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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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 = FF_I_TYPE;
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p->key_frame = 1;
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buf += hsize;
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dsize = buf_size - hsize;
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n = avctx->width * (depth / 8);
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if(n * avctx->height > dsize){
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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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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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switch(depth){
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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 16:
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for(i = 0; i < avctx->height; i++){
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uint16_t *src = (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++ = le2me_16(*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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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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*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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AVCodec bmp_decoder = {
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"bmp",
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CODEC_TYPE_VIDEO,
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CODEC_ID_BMP,
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sizeof(BMPContext),
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bmp_decode_init,
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NULL,
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NULL,
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bmp_decode_frame
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};
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