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
25 #include "bytestream.h"
30 static int bmp_decode_frame(AVCodecContext *avctx,
31 void *data, int *got_frame,
34 const uint8_t *buf = avpkt->data;
35 int buf_size = avpkt->size;
37 unsigned int fsize, hsize;
42 int i, j, n, linesize, ret;
43 uint32_t rgb[3] = {0};
47 const uint8_t *buf0 = buf;
51 av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
52 return AVERROR_INVALIDDATA;
55 if (bytestream_get_byte(&buf) != 'B' ||
56 bytestream_get_byte(&buf) != 'M') {
57 av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
58 return AVERROR_INVALIDDATA;
61 fsize = bytestream_get_le32(&buf);
62 if (buf_size < fsize) {
63 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %u), trying to decode anyway\n",
68 buf += 2; /* reserved1 */
69 buf += 2; /* reserved2 */
71 hsize = bytestream_get_le32(&buf); /* header size */
72 ihsize = bytestream_get_le32(&buf); /* more header size */
73 if (ihsize + 14LL > hsize) {
74 av_log(avctx, AV_LOG_ERROR, "invalid header size %u\n", hsize);
75 return AVERROR_INVALIDDATA;
78 /* sometimes file size is set to some headers size, set a real size in that case */
79 if (fsize == 14 || fsize == ihsize + 14)
83 av_log(avctx, AV_LOG_ERROR,
84 "Declared file size is less than header size (%u < %u)\n",
86 return AVERROR_INVALIDDATA;
93 case 108: // windib v4
94 case 124: // windib v5
95 width = bytestream_get_le32(&buf);
96 height = bytestream_get_le32(&buf);
99 width = bytestream_get_le16(&buf);
100 height = bytestream_get_le16(&buf);
103 avpriv_report_missing_feature(avctx, "Information header size %u",
105 return AVERROR_PATCHWELCOME;
109 if (bytestream_get_le16(&buf) != 1) {
110 av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
111 return AVERROR_INVALIDDATA;
114 depth = bytestream_get_le16(&buf);
117 comp = bytestream_get_le32(&buf);
121 if (comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 &&
123 av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
124 return AVERROR_INVALIDDATA;
127 if (comp == BMP_BITFIELDS) {
129 rgb[0] = bytestream_get_le32(&buf);
130 rgb[1] = bytestream_get_le32(&buf);
131 rgb[2] = bytestream_get_le32(&buf);
133 alpha = bytestream_get_le32(&buf);
136 ret = ff_set_dimensions(avctx, width, height > 0 ? height : -(unsigned)height);
138 av_log(avctx, AV_LOG_ERROR, "Failed to set dimensions %d %d\n", width, height);
139 return AVERROR_INVALIDDATA;
142 avctx->pix_fmt = AV_PIX_FMT_NONE;
146 if (comp == BMP_BITFIELDS) {
147 if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
148 avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
149 else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
150 avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0;
151 else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
152 avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
153 else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
154 avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0;
156 av_log(avctx, AV_LOG_ERROR, "Unknown bitfields "
157 "%0"PRIX32" %0"PRIX32" %0"PRIX32"\n", rgb[0], rgb[1], rgb[2]);
158 return AVERROR(EINVAL);
161 avctx->pix_fmt = AV_PIX_FMT_BGRA;
165 avctx->pix_fmt = AV_PIX_FMT_BGR24;
169 avctx->pix_fmt = AV_PIX_FMT_RGB555;
170 else if (comp == BMP_BITFIELDS) {
171 if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
172 avctx->pix_fmt = AV_PIX_FMT_RGB565;
173 else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
174 avctx->pix_fmt = AV_PIX_FMT_RGB555;
175 else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
176 avctx->pix_fmt = AV_PIX_FMT_RGB444;
178 av_log(avctx, AV_LOG_ERROR,
179 "Unknown bitfields %0"PRIX32" %0"PRIX32" %0"PRIX32"\n",
180 rgb[0], rgb[1], rgb[2]);
181 return AVERROR(EINVAL);
186 if (hsize - ihsize - 14 > 0)
187 avctx->pix_fmt = AV_PIX_FMT_PAL8;
189 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
193 if (hsize - ihsize - 14 > 0) {
194 avctx->pix_fmt = AV_PIX_FMT_PAL8;
196 av_log(avctx, AV_LOG_ERROR, "Unknown palette for %u-colour BMP\n",
198 return AVERROR_INVALIDDATA;
202 av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth);
203 return AVERROR_INVALIDDATA;
206 if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
207 av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
208 return AVERROR_INVALIDDATA;
211 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
213 p->pict_type = AV_PICTURE_TYPE_I;
217 dsize = buf_size - hsize;
219 /* Line size in file multiple of 4 */
220 n = ((avctx->width * depth + 31) / 8) & ~3;
222 if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) {
223 n = (avctx->width * depth + 7) / 8;
224 if (n * avctx->height > dsize) {
225 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
226 dsize, n * avctx->height);
227 return AVERROR_INVALIDDATA;
229 av_log(avctx, AV_LOG_ERROR, "data size too small, assuming missing line alignment\n");
232 // RLE may skip decoding some picture areas, so blank picture before decoding
233 if (comp == BMP_RLE4 || comp == BMP_RLE8)
234 memset(p->data[0], 0, avctx->height * p->linesize[0]);
237 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
238 linesize = -p->linesize[0];
241 linesize = p->linesize[0];
244 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
245 int colors = 1 << depth;
247 memset(p->data[1], 0, 1024);
252 t = bytestream_get_le32(&buf);
253 if (t < 0 || t > (1 << depth)) {
254 av_log(avctx, AV_LOG_ERROR,
255 "Incorrect number of colors - %X for bitdepth %u\n",
261 colors = FFMIN(256, (hsize-ihsize-14) / 3);
263 buf = buf0 + 14 + ihsize; //palette location
264 // OS/2 bitmap, 3 bytes per palette entry
265 if ((hsize-ihsize-14) < (colors << 2)) {
266 if ((hsize-ihsize-14) < colors * 3) {
267 av_log(avctx, AV_LOG_ERROR, "palette doesn't fit in packet\n");
268 return AVERROR_INVALIDDATA;
270 for (i = 0; i < colors; i++)
271 ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf);
273 for (i = 0; i < colors; i++)
274 ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
278 if (comp == BMP_RLE4 || comp == BMP_RLE8) {
279 if (comp == BMP_RLE8 && height < 0) {
280 p->data[0] += p->linesize[0] * (avctx->height - 1);
281 p->linesize[0] = -p->linesize[0];
283 bytestream2_init(&gb, buf, dsize);
284 ff_msrle_decode(avctx, p, depth, &gb);
286 p->data[0] += p->linesize[0] * (avctx->height - 1);
287 p->linesize[0] = -p->linesize[0];
292 for (i = 0; i < avctx->height; i++) {
294 for (j = 0; j < n; j++) {
295 ptr[j*8+0] = buf[j] >> 7;
296 ptr[j*8+1] = (buf[j] >> 6) & 1;
297 ptr[j*8+2] = (buf[j] >> 5) & 1;
298 ptr[j*8+3] = (buf[j] >> 4) & 1;
299 ptr[j*8+4] = (buf[j] >> 3) & 1;
300 ptr[j*8+5] = (buf[j] >> 2) & 1;
301 ptr[j*8+6] = (buf[j] >> 1) & 1;
302 ptr[j*8+7] = buf[j] & 1;
311 for (i = 0; i < avctx->height; i++) {
318 for (i = 0; i < avctx->height; i++) {
320 for (j = 0; j < n; j++) {
321 ptr[j*2+0] = (buf[j] >> 4) & 0xF;
322 ptr[j*2+1] = buf[j] & 0xF;
329 for (i = 0; i < avctx->height; i++) {
330 const uint16_t *src = (const uint16_t *) buf;
331 uint16_t *dst = (uint16_t *) ptr;
333 for (j = 0; j < avctx->width; j++)
334 *dst++ = av_le2ne16(*src++);
341 av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
342 return AVERROR_INVALIDDATA;
345 if (avctx->pix_fmt == AV_PIX_FMT_BGRA) {
346 for (i = 0; i < avctx->height; i++) {
348 uint8_t *ptr = p->data[0] + p->linesize[0]*i + 3;
349 for (j = 0; j < avctx->width; j++) {
353 if (j < avctx->width)
356 if (i == avctx->height)
357 avctx->pix_fmt = p->format = AV_PIX_FMT_BGR0;
365 AVCodec ff_bmp_decoder = {
367 .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
368 .type = AVMEDIA_TYPE_VIDEO,
369 .id = AV_CODEC_ID_BMP,
370 .decode = bmp_decode_frame,
371 .capabilities = AV_CODEC_CAP_DR1,