2 * BMP image format decoder
3 * Copyright (c) 2005 Mans Rullgard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "bytestream.h"
26 static int bmp_decode_init(AVCodecContext *avctx){
27 BMPContext *s = avctx->priv_data;
29 avcodec_get_frame_defaults((AVFrame*)&s->picture);
30 avctx->coded_frame = (AVFrame*)&s->picture;
35 static int bmp_decode_frame(AVCodecContext *avctx,
36 void *data, int *data_size,
37 const uint8_t *buf, int buf_size)
39 BMPContext *s = avctx->priv_data;
40 AVFrame *picture = data;
41 AVFrame *p = &s->picture;
42 unsigned int fsize, hsize;
47 int i, j, n, linesize;
51 const uint8_t *buf0 = buf;
54 av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
58 if(bytestream_get_byte(&buf) != 'B' ||
59 bytestream_get_byte(&buf) != 'M') {
60 av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
64 fsize = bytestream_get_le32(&buf);
66 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
71 buf += 2; /* reserved1 */
72 buf += 2; /* reserved2 */
74 hsize = bytestream_get_le32(&buf); /* header size */
76 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
81 ihsize = bytestream_get_le32(&buf); /* more header size */
82 if(ihsize + 14 > hsize){
83 av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
87 width = bytestream_get_le32(&buf);
88 height = bytestream_get_le32(&buf);
90 if(bytestream_get_le16(&buf) != 1){ /* planes */
91 av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
95 depth = bytestream_get_le16(&buf);
98 comp = bytestream_get_le32(&buf);
102 if(comp != BMP_RGB && comp != BMP_BITFIELDS){
103 av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
107 if(comp == BMP_BITFIELDS){
109 rgb[0] = bytestream_get_le32(&buf);
110 rgb[1] = bytestream_get_le32(&buf);
111 rgb[2] = bytestream_get_le32(&buf);
114 avctx->width = width;
115 avctx->height = height > 0? height: -height;
117 avctx->pix_fmt = PIX_FMT_NONE;
121 if(comp == BMP_BITFIELDS){
122 rgb[0] = (rgb[0] >> 15) & 3;
123 rgb[1] = (rgb[1] >> 15) & 3;
124 rgb[2] = (rgb[2] >> 15) & 3;
126 if(rgb[0] + rgb[1] + rgb[2] != 3 ||
127 rgb[0] == rgb[1] || rgb[0] == rgb[2] || rgb[1] == rgb[2]){
136 avctx->pix_fmt = PIX_FMT_BGR24;
139 avctx->pix_fmt = PIX_FMT_BGR24;
143 avctx->pix_fmt = PIX_FMT_RGB555;
146 av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth);
150 if(avctx->pix_fmt == PIX_FMT_NONE){
151 av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
156 avctx->release_buffer(avctx, p);
159 if(avctx->get_buffer(avctx, p) < 0){
160 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
163 p->pict_type = FF_I_TYPE;
167 dsize = buf_size - hsize;
169 /* Line size in file multiple of 4 */
170 n = (avctx->width * (depth / 8) + 3) & ~3;
172 if(n * avctx->height > dsize){
173 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
174 dsize, n * avctx->height);
179 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
180 linesize = -p->linesize[0];
183 linesize = p->linesize[0];
188 for(i = 0; i < avctx->height; i++){
189 memcpy(ptr, buf, avctx->width*(depth>>3));
195 for(i = 0; i < avctx->height; i++){
196 const uint16_t *src = (const uint16_t *) buf;
197 uint16_t *dst = (uint16_t *) ptr;
199 for(j = 0; j < avctx->width; j++)
200 *dst++ = le2me_16(*src++);
207 for(i = 0; i < avctx->height; i++){
208 const uint8_t *src = buf;
211 for(j = 0; j < avctx->width; j++){
212 dst[0] = src[rgb[2]];
213 dst[1] = src[rgb[1]];
214 dst[2] = src[rgb[0]];
224 av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
228 *picture = s->picture;
229 *data_size = sizeof(AVPicture);
234 static int bmp_decode_end(AVCodecContext *avctx)
236 BMPContext* c = avctx->priv_data;
238 if (c->picture.data[0])
239 avctx->release_buffer(avctx, &c->picture);
244 AVCodec bmp_decoder = {