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"
27 static av_cold int bmp_decode_init(AVCodecContext *avctx){
28 BMPContext *s = avctx->priv_data;
30 avcodec_get_frame_defaults((AVFrame*)&s->picture);
31 avctx->coded_frame = (AVFrame*)&s->picture;
36 static int bmp_decode_frame(AVCodecContext *avctx,
37 void *data, int *data_size,
40 const uint8_t *buf = avpkt->data;
41 int buf_size = avpkt->size;
42 BMPContext *s = avctx->priv_data;
43 AVFrame *picture = data;
44 AVFrame *p = &s->picture;
45 unsigned int fsize, hsize;
50 int i, j, n, linesize;
55 const uint8_t *buf0 = buf;
58 av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
62 if(bytestream_get_byte(&buf) != 'B' ||
63 bytestream_get_byte(&buf) != 'M') {
64 av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
68 fsize = bytestream_get_le32(&buf);
70 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d), trying to decode anyway\n",
75 buf += 2; /* reserved1 */
76 buf += 2; /* reserved2 */
78 hsize = bytestream_get_le32(&buf); /* header size */
79 ihsize = bytestream_get_le32(&buf); /* more header size */
80 if(ihsize + 14 > hsize){
81 av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
85 /* sometimes file size is set to some headers size, set a real size in that case */
86 if(fsize == 14 || fsize == ihsize + 14)
90 av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
99 case 108: // windib v4
100 case 124: // windib v5
101 width = bytestream_get_le32(&buf);
102 height = bytestream_get_le32(&buf);
105 width = bytestream_get_le16(&buf);
106 height = bytestream_get_le16(&buf);
109 av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
113 if(bytestream_get_le16(&buf) != 1){ /* planes */
114 av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
118 depth = bytestream_get_le16(&buf);
120 if(ihsize == 40 || ihsize == 64 || ihsize == 56)
121 comp = bytestream_get_le32(&buf);
125 if(comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 && comp != BMP_RLE8){
126 av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
130 if(comp == BMP_BITFIELDS){
132 rgb[0] = bytestream_get_le32(&buf);
133 rgb[1] = bytestream_get_le32(&buf);
134 rgb[2] = bytestream_get_le32(&buf);
136 alpha = bytestream_get_le32(&buf);
139 avctx->width = width;
140 avctx->height = height > 0? height: -height;
142 avctx->pix_fmt = PIX_FMT_NONE;
146 if(comp == BMP_BITFIELDS){
147 if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
148 avctx->pix_fmt = alpha ? PIX_FMT_ABGR : PIX_FMT_0BGR;
149 else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
150 avctx->pix_fmt = alpha ? PIX_FMT_BGRA : PIX_FMT_BGR0;
151 else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
152 avctx->pix_fmt = alpha ? PIX_FMT_ARGB : PIX_FMT_0RGB;
153 else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
154 avctx->pix_fmt = alpha ? PIX_FMT_RGBA : PIX_FMT_RGB0;
156 av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
157 return AVERROR(EINVAL);
160 avctx->pix_fmt = PIX_FMT_BGRA;
164 avctx->pix_fmt = PIX_FMT_BGR24;
168 avctx->pix_fmt = PIX_FMT_RGB555;
169 else if (comp == BMP_BITFIELDS) {
170 if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
171 avctx->pix_fmt = PIX_FMT_RGB565;
172 else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
173 avctx->pix_fmt = PIX_FMT_RGB555;
174 else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
175 avctx->pix_fmt = PIX_FMT_RGB444;
177 av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
178 return AVERROR(EINVAL);
183 if(hsize - ihsize - 14 > 0)
184 avctx->pix_fmt = PIX_FMT_PAL8;
186 avctx->pix_fmt = PIX_FMT_GRAY8;
190 if(hsize - ihsize - 14 > 0){
191 avctx->pix_fmt = PIX_FMT_PAL8;
193 av_log(avctx, AV_LOG_ERROR, "Unknown palette for %d-colour BMP\n", 1<<depth);
198 av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth);
202 if(avctx->pix_fmt == PIX_FMT_NONE){
203 av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
208 avctx->release_buffer(avctx, p);
211 if(avctx->get_buffer(avctx, p) < 0){
212 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
215 p->pict_type = AV_PICTURE_TYPE_I;
219 dsize = buf_size - hsize;
221 /* Line size in file multiple of 4 */
222 n = ((avctx->width * depth + 31) / 8) & ~3;
224 if(n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8){
225 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
226 dsize, n * avctx->height);
230 // RLE may skip decoding some picture areas, so blank picture before decoding
231 if(comp == BMP_RLE4 || comp == BMP_RLE8)
232 memset(p->data[0], 0, avctx->height * p->linesize[0]);
234 if(depth == 4 || depth == 8)
235 memset(p->data[1], 0, 1024);
238 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
239 linesize = -p->linesize[0];
242 linesize = p->linesize[0];
245 if(avctx->pix_fmt == PIX_FMT_PAL8){
246 int colors = 1 << depth;
250 t = bytestream_get_le32(&buf);
251 if(t < 0 || t > (1 << depth)){
252 av_log(avctx, AV_LOG_ERROR, "Incorrect number of colors - %X for bitdepth %d\n", t, depth);
257 buf = buf0 + 14 + ihsize; //palette location
258 if((hsize-ihsize-14) < (colors << 2)){ // OS/2 bitmap, 3 bytes per palette entry
259 for(i = 0; i < colors; i++)
260 ((uint32_t*)p->data[1])[i] = (0xff<<24) | bytestream_get_le24(&buf);
262 for(i = 0; i < colors; i++)
263 ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
267 if(comp == BMP_RLE4 || comp == BMP_RLE8){
269 p->data[0] += p->linesize[0] * (avctx->height - 1);
270 p->linesize[0] = -p->linesize[0];
272 ff_msrle_decode(avctx, (AVPicture*)p, depth, buf, dsize);
274 p->data[0] += p->linesize[0] * (avctx->height - 1);
275 p->linesize[0] = -p->linesize[0];
280 for (i = 0; i < avctx->height; i++) {
282 for (j = 0; j < n; j++) {
283 ptr[j*8+0] = buf[j] >> 7;
284 ptr[j*8+1] = (buf[j] >> 6) & 1;
285 ptr[j*8+2] = (buf[j] >> 5) & 1;
286 ptr[j*8+3] = (buf[j] >> 4) & 1;
287 ptr[j*8+4] = (buf[j] >> 3) & 1;
288 ptr[j*8+5] = (buf[j] >> 2) & 1;
289 ptr[j*8+6] = (buf[j] >> 1) & 1;
290 ptr[j*8+7] = buf[j] & 1;
299 for(i = 0; i < avctx->height; i++){
306 for(i = 0; i < avctx->height; i++){
308 for(j = 0; j < n; j++){
309 ptr[j*2+0] = (buf[j] >> 4) & 0xF;
310 ptr[j*2+1] = buf[j] & 0xF;
317 for(i = 0; i < avctx->height; i++){
318 const uint16_t *src = (const uint16_t *) buf;
319 uint16_t *dst = (uint16_t *) ptr;
321 for(j = 0; j < avctx->width; j++)
322 *dst++ = av_le2ne16(*src++);
329 av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
334 *picture = s->picture;
335 *data_size = sizeof(AVPicture);
340 static av_cold int bmp_decode_end(AVCodecContext *avctx)
342 BMPContext* c = avctx->priv_data;
344 if (c->picture.data[0])
345 avctx->release_buffer(avctx, &c->picture);
350 AVCodec ff_bmp_decoder = {
352 .type = AVMEDIA_TYPE_VIDEO,
354 .priv_data_size = sizeof(BMPContext),
355 .init = bmp_decode_init,
356 .close = bmp_decode_end,
357 .decode = bmp_decode_frame,
358 .capabilities = CODEC_CAP_DR1,
359 .long_name = NULL_IF_CONFIG_SMALL("BMP image"),