libavcodec/bmp.c

   1 /*
   2  * BMP image format decoder
   3  * Copyright (c) 2005 Mans Rullgard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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.
  11  *
  12  * Libav 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.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avcodec.h"
  23 #include "bytestream.h"
  24 #include "bmp.h"
  25 #include "msrledec.h"
  26
  27 static av_cold int bmp_decode_init(AVCodecContext *avctx){
  28     BMPContext *s = avctx->priv_data;
  29
  30     avcodec_get_frame_defaults(&s->picture);
  31     avctx->coded_frame = &s->picture;
  32
  33     return 0;
  34 }
  35
  36 static int bmp_decode_frame(AVCodecContext *avctx,
  37                             void *data, int *data_size,
  38                             AVPacket *avpkt)
  39 {
  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;
  46     int width, height;
  47     unsigned int depth;
  48     BiCompression comp;
  49     unsigned int ihsize;
  50     int i, j, n, linesize;
  51     uint32_t rgb[3];
  52     uint8_t *ptr;
  53     int dsize;
  54     const uint8_t *buf0 = buf;
  55
  56     if(buf_size < 14){
  57         av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
  58         return -1;
  59     }
  60
  61     if(bytestream_get_byte(&buf) != 'B' ||
  62        bytestream_get_byte(&buf) != 'M') {
  63         av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
  64         return -1;
  65     }
  66
  67     fsize = bytestream_get_le32(&buf);
  68     if(buf_size < fsize){
  69         av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d), trying to decode anyway\n",
  70                buf_size, fsize);
  71         fsize = buf_size;
  72     }
  73
  74     buf += 2; /* reserved1 */
  75     buf += 2; /* reserved2 */
  76
  77     hsize = bytestream_get_le32(&buf); /* header size */
  78     ihsize = bytestream_get_le32(&buf);       /* more header size */
  79     if(ihsize + 14 > hsize){
  80         av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
  81         return -1;
  82     }
  83
  84     /* sometimes file size is set to some headers size, set a real size in that case */
  85     if(fsize == 14 || fsize == ihsize + 14)
  86         fsize = buf_size - 2;
  87
  88     if(fsize <= hsize){
  89         av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
  90                fsize, hsize);
  91         return -1;
  92     }
  93
  94     switch(ihsize){
  95     case  40: // windib v3
  96     case  64: // OS/2 v2
  97     case 108: // windib v4
  98     case 124: // windib v5
  99         width = bytestream_get_le32(&buf);
 100         height = bytestream_get_le32(&buf);
 101         break;
 102     case  12: // OS/2 v1
 103         width  = bytestream_get_le16(&buf);
 104         height = bytestream_get_le16(&buf);
 105         break;
 106     default:
 107         av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
 108         return -1;
 109     }
 110
 111     if(bytestream_get_le16(&buf) != 1){ /* planes */
 112         av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
 113         return -1;
 114     }
 115
 116     depth = bytestream_get_le16(&buf);
 117
 118     if(ihsize == 40)
 119         comp = bytestream_get_le32(&buf);
 120     else
 121         comp = BMP_RGB;
 122
 123     if(comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 && comp != BMP_RLE8){
 124         av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
 125         return -1;
 126     }
 127
 128     if(comp == BMP_BITFIELDS){
 129         buf += 20;
 130         rgb[0] = bytestream_get_le32(&buf);
 131         rgb[1] = bytestream_get_le32(&buf);
 132         rgb[2] = bytestream_get_le32(&buf);
 133     }
 134
 135     avctx->width = width;
 136     avctx->height = height > 0? height: -height;
 137
 138     avctx->pix_fmt = PIX_FMT_NONE;
 139
 140     switch(depth){
 141     case 32:
 142         if(comp == BMP_BITFIELDS){
 143             rgb[0] = (rgb[0] >> 15) & 3;
 144             rgb[1] = (rgb[1] >> 15) & 3;
 145             rgb[2] = (rgb[2] >> 15) & 3;
 146
 147             if(rgb[0] + rgb[1] + rgb[2] != 3 ||
 148                rgb[0] == rgb[1] || rgb[0] == rgb[2] || rgb[1] == rgb[2]){
 149                 break;
 150             }
 151         } else {
 152             rgb[0] = 2;
 153             rgb[1] = 1;
 154             rgb[2] = 0;
 155         }
 156
 157         avctx->pix_fmt = PIX_FMT_BGR24;
 158         break;
 159     case 24:
 160         avctx->pix_fmt = PIX_FMT_BGR24;
 161         break;
 162     case 16:
 163         if(comp == BMP_RGB)
 164             avctx->pix_fmt = PIX_FMT_RGB555;
 165         else if (comp == BMP_BITFIELDS) {
 166             if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
 167                avctx->pix_fmt = PIX_FMT_RGB565;
 168             else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
 169                avctx->pix_fmt = PIX_FMT_RGB555;
 170             else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
 171                avctx->pix_fmt = PIX_FMT_RGB444;
 172             else {
 173                av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
 174                return AVERROR(EINVAL);
 175             }
 176         }
 177         break;
 178     case 8:
 179         if(hsize - ihsize - 14 > 0)
 180             avctx->pix_fmt = PIX_FMT_PAL8;
 181         else
 182             avctx->pix_fmt = PIX_FMT_GRAY8;
 183         break;
 184     case 1:
 185     case 4:
 186         if(hsize - ihsize - 14 > 0){
 187             avctx->pix_fmt = PIX_FMT_PAL8;
 188         }else{
 189             av_log(avctx, AV_LOG_ERROR, "Unknown palette for %d-colour BMP\n", 1<<depth);
 190             return -1;
 191         }
 192         break;
 193     default:
 194         av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth);
 195         return -1;
 196     }
 197
 198     if(avctx->pix_fmt == PIX_FMT_NONE){
 199         av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
 200         return -1;
 201     }
 202
 203     if(p->data[0])
 204         avctx->release_buffer(avctx, p);
 205
 206     p->reference = 0;
 207     if(avctx->get_buffer(avctx, p) < 0){
 208         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 209         return -1;
 210     }
 211     p->pict_type = AV_PICTURE_TYPE_I;
 212     p->key_frame = 1;
 213
 214     buf = buf0 + hsize;
 215     dsize = buf_size - hsize;
 216
 217     /* Line size in file multiple of 4 */
 218     n = ((avctx->width * depth) / 8 + 3) & ~3;
 219
 220     if(n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8){
 221         av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
 222                dsize, n * avctx->height);
 223         return -1;
 224     }
 225
 226     // RLE may skip decoding some picture areas, so blank picture before decoding
 227     if(comp == BMP_RLE4 || comp == BMP_RLE8)
 228         memset(p->data[0], 0, avctx->height * p->linesize[0]);
 229
 230     if(depth == 4 || depth == 8)
 231         memset(p->data[1], 0, 1024);
 232
 233     if(height > 0){
 234         ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
 235         linesize = -p->linesize[0];
 236     } else {
 237         ptr = p->data[0];
 238         linesize = p->linesize[0];
 239     }
 240
 241     if(avctx->pix_fmt == PIX_FMT_PAL8){
 242         int colors = 1 << depth;
 243         if(ihsize >= 36){
 244             int t;
 245             buf = buf0 + 46;
 246             t = bytestream_get_le32(&buf);
 247             if(t < 0 || t > (1 << depth)){
 248                 av_log(avctx, AV_LOG_ERROR, "Incorrect number of colors - %X for bitdepth %d\n", t, depth);
 249             }else if(t){
 250                 colors = t;
 251             }
 252         }
 253         buf = buf0 + 14 + ihsize; //palette location
 254         if((hsize-ihsize-14) < (colors << 2)){ // OS/2 bitmap, 3 bytes per palette entry
 255             for(i = 0; i < colors; i++)
 256                 ((uint32_t*)p->data[1])[i] = bytestream_get_le24(&buf);
 257         }else{
 258             for(i = 0; i < colors; i++)
 259                 ((uint32_t*)p->data[1])[i] = bytestream_get_le32(&buf);
 260         }
 261         buf = buf0 + hsize;
 262     }
 263     if(comp == BMP_RLE4 || comp == BMP_RLE8){
 264         if(height < 0){
 265             p->data[0] += p->linesize[0] * (avctx->height - 1);
 266             p->linesize[0] = -p->linesize[0];
 267         }
 268         ff_msrle_decode(avctx, (AVPicture*)p, depth, buf, dsize);
 269         if(height < 0){
 270             p->data[0] += p->linesize[0] * (avctx->height - 1);
 271             p->linesize[0] = -p->linesize[0];
 272         }
 273     }else{
 274         switch(depth){
 275         case 1:
 276             for (i = 0; i < avctx->height; i++) {
 277                 int j;
 278                 for (j = 0; j < n; j++) {
 279                     ptr[j*8+0] =  buf[j] >> 7;
 280                     ptr[j*8+1] = (buf[j] >> 6) & 1;
 281                     ptr[j*8+2] = (buf[j] >> 5) & 1;
 282                     ptr[j*8+3] = (buf[j] >> 4) & 1;
 283                     ptr[j*8+4] = (buf[j] >> 3) & 1;
 284                     ptr[j*8+5] = (buf[j] >> 2) & 1;
 285                     ptr[j*8+6] = (buf[j] >> 1) & 1;
 286                     ptr[j*8+7] =  buf[j]       & 1;
 287                 }
 288                 buf += n;
 289                 ptr += linesize;
 290             }
 291             break;
 292         case 8:
 293         case 24:
 294             for(i = 0; i < avctx->height; i++){
 295                 memcpy(ptr, buf, n);
 296                 buf += n;
 297                 ptr += linesize;
 298             }
 299             break;
 300         case 4:
 301             for(i = 0; i < avctx->height; i++){
 302                 int j;
 303                 for(j = 0; j < n; j++){
 304                     ptr[j*2+0] = (buf[j] >> 4) & 0xF;
 305                     ptr[j*2+1] = buf[j] & 0xF;
 306                 }
 307                 buf += n;
 308                 ptr += linesize;
 309             }
 310             break;
 311         case 16:
 312             for(i = 0; i < avctx->height; i++){
 313                 const uint16_t *src = (const uint16_t *) buf;
 314                 uint16_t *dst = (uint16_t *) ptr;
 315
 316                 for(j = 0; j < avctx->width; j++)
 317                     *dst++ = av_le2ne16(*src++);
 318
 319                 buf += n;
 320                 ptr += linesize;
 321             }
 322             break;
 323         case 32:
 324             for(i = 0; i < avctx->height; i++){
 325                 const uint8_t *src = buf;
 326                 uint8_t *dst = ptr;
 327
 328                 for(j = 0; j < avctx->width; j++){
 329                     dst[0] = src[rgb[2]];
 330                     dst[1] = src[rgb[1]];
 331                     dst[2] = src[rgb[0]];
 332                     dst += 3;
 333                     src += 4;
 334                 }
 335
 336                 buf += n;
 337                 ptr += linesize;
 338             }
 339             break;
 340         default:
 341             av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
 342             return -1;
 343         }
 344     }
 345
 346     *picture = s->picture;
 347     *data_size = sizeof(AVPicture);
 348
 349     return buf_size;
 350 }
 351
 352 static av_cold int bmp_decode_end(AVCodecContext *avctx)
 353 {
 354     BMPContext* c = avctx->priv_data;
 355
 356     if (c->picture.data[0])
 357         avctx->release_buffer(avctx, &c->picture);
 358
 359     return 0;
 360 }
 361
 362 AVCodec ff_bmp_decoder = {
 363     .name           = "bmp",
 364     .type           = AVMEDIA_TYPE_VIDEO,
 365     .id             = CODEC_ID_BMP,
 366     .priv_data_size = sizeof(BMPContext),
 367     .init           = bmp_decode_init,
 368     .close          = bmp_decode_end,
 369     .decode         = bmp_decode_frame,
 370     .capabilities   = CODEC_CAP_DR1,
 371     .long_name = NULL_IF_CONFIG_SMALL("BMP image"),
 372 };