FFmpeg: libavcodec/bmp.c Source File

00001 /*
00002  * BMP image format decoder
00003  * Copyright (c) 2005 Mans Rullgard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "avcodec.h"
00023 #include "bytestream.h"
00024 #include "bmp.h"
00025 #include "internal.h"
00026 #include "msrledec.h"
00027 
00028 static av_cold int bmp_decode_init(AVCodecContext *avctx){
00029     BMPContext *s = avctx->priv_data;
00030 
00031     avcodec_get_frame_defaults(&s->picture);
00032     avctx->coded_frame = &s->picture;
00033 
00034     return 0;
00035 }
00036 
00037 static int bmp_decode_frame(AVCodecContext *avctx,
00038                             void *data, int *got_frame,
00039                             AVPacket *avpkt)
00040 {
00041     const uint8_t *buf = avpkt->data;
00042     int buf_size = avpkt->size;
00043     BMPContext *s = avctx->priv_data;
00044     AVFrame *picture = data;
00045     AVFrame *p = &s->picture;
00046     unsigned int fsize, hsize;
00047     int width, height;
00048     unsigned int depth;
00049     BiCompression comp;
00050     unsigned int ihsize;
00051     int i, j, n, linesize;
00052     uint32_t rgb[3];
00053     uint32_t alpha = 0;
00054     uint8_t *ptr;
00055     int dsize;
00056     const uint8_t *buf0 = buf;
00057     GetByteContext gb;
00058 
00059     if(buf_size < 14){
00060         av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
00061         return -1;
00062     }
00063 
00064     if(bytestream_get_byte(&buf) != 'B' ||
00065        bytestream_get_byte(&buf) != 'M') {
00066         av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
00067         return -1;
00068     }
00069 
00070     fsize = bytestream_get_le32(&buf);
00071     if(buf_size < fsize){
00072         av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d), trying to decode anyway\n",
00073                buf_size, fsize);
00074         fsize = buf_size;
00075     }
00076 
00077     buf += 2; /* reserved1 */
00078     buf += 2; /* reserved2 */
00079 
00080     hsize = bytestream_get_le32(&buf); /* header size */
00081     ihsize = bytestream_get_le32(&buf);       /* more header size */
00082     if(ihsize + 14 > hsize){
00083         av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
00084         return -1;
00085     }
00086 
00087     /* sometimes file size is set to some headers size, set a real size in that case */
00088     if(fsize == 14 || fsize == ihsize + 14)
00089         fsize = buf_size - 2;
00090 
00091     if(fsize <= hsize){
00092         av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
00093                fsize, hsize);
00094         return -1;
00095     }
00096 
00097     switch(ihsize){
00098     case  40: // windib
00099     case  56: // windib v3
00100     case  64: // OS/2 v2
00101     case 108: // windib v4
00102     case 124: // windib v5
00103         width = bytestream_get_le32(&buf);
00104         height = bytestream_get_le32(&buf);
00105         break;
00106     case  12: // OS/2 v1
00107         width  = bytestream_get_le16(&buf);
00108         height = bytestream_get_le16(&buf);
00109         break;
00110     default:
00111         av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
00112         return -1;
00113     }
00114 
00115     if(bytestream_get_le16(&buf) != 1){ /* planes */
00116         av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
00117         return -1;
00118     }
00119 
00120     depth = bytestream_get_le16(&buf);
00121 
00122     if (ihsize >= 40)
00123         comp = bytestream_get_le32(&buf);
00124     else
00125         comp = BMP_RGB;
00126 
00127     if(comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 && comp != BMP_RLE8){
00128         av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
00129         return -1;
00130     }
00131 
00132     if(comp == BMP_BITFIELDS){
00133         buf += 20;
00134         rgb[0] = bytestream_get_le32(&buf);
00135         rgb[1] = bytestream_get_le32(&buf);
00136         rgb[2] = bytestream_get_le32(&buf);
00137         alpha = bytestream_get_le32(&buf);
00138     }
00139 
00140     avctx->width = width;
00141     avctx->height = height > 0? height: -height;
00142 
00143     avctx->pix_fmt = AV_PIX_FMT_NONE;
00144 
00145     switch(depth){
00146     case 32:
00147         if(comp == BMP_BITFIELDS){
00148             if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
00149                 avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
00150             else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
00151                 avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0;
00152             else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
00153                 avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
00154             else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
00155                 avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0;
00156             else {
00157                 av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
00158                 return AVERROR(EINVAL);
00159             }
00160         } else {
00161             avctx->pix_fmt = AV_PIX_FMT_BGRA;
00162         }
00163         break;
00164     case 24:
00165         avctx->pix_fmt = AV_PIX_FMT_BGR24;
00166         break;
00167     case 16:
00168         if(comp == BMP_RGB)
00169             avctx->pix_fmt = AV_PIX_FMT_RGB555;
00170         else if (comp == BMP_BITFIELDS) {
00171             if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
00172                avctx->pix_fmt = AV_PIX_FMT_RGB565;
00173             else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
00174                avctx->pix_fmt = AV_PIX_FMT_RGB555;
00175             else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
00176                avctx->pix_fmt = AV_PIX_FMT_RGB444;
00177             else {
00178                av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
00179                return AVERROR(EINVAL);
00180             }
00181         }
00182         break;
00183     case 8:
00184         if(hsize - ihsize - 14 > 0)
00185             avctx->pix_fmt = AV_PIX_FMT_PAL8;
00186         else
00187             avctx->pix_fmt = AV_PIX_FMT_GRAY8;
00188         break;
00189     case 1:
00190     case 4:
00191         if(hsize - ihsize - 14 > 0){
00192             avctx->pix_fmt = AV_PIX_FMT_PAL8;
00193         }else{
00194             av_log(avctx, AV_LOG_ERROR, "Unknown palette for %d-colour BMP\n", 1<<depth);
00195             return -1;
00196         }
00197         break;
00198     default:
00199         av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth);
00200         return -1;
00201     }
00202 
00203     if(avctx->pix_fmt == AV_PIX_FMT_NONE){
00204         av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
00205         return -1;
00206     }
00207 
00208     if(p->data[0])
00209         avctx->release_buffer(avctx, p);
00210 
00211     p->reference = 0;
00212     if(ff_get_buffer(avctx, p) < 0){
00213         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00214         return -1;
00215     }
00216     p->pict_type = AV_PICTURE_TYPE_I;
00217     p->key_frame = 1;
00218 
00219     buf = buf0 + hsize;
00220     dsize = buf_size - hsize;
00221 
00222     /* Line size in file multiple of 4 */
00223     n = ((avctx->width * depth + 31) / 8) & ~3;
00224 
00225     if(n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8){
00226         av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
00227                dsize, n * avctx->height);
00228         return -1;
00229     }
00230 
00231     // RLE may skip decoding some picture areas, so blank picture before decoding
00232     if(comp == BMP_RLE4 || comp == BMP_RLE8)
00233         memset(p->data[0], 0, avctx->height * p->linesize[0]);
00234 
00235     if(height > 0){
00236         ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
00237         linesize = -p->linesize[0];
00238     } else {
00239         ptr = p->data[0];
00240         linesize = p->linesize[0];
00241     }
00242 
00243     if(avctx->pix_fmt == AV_PIX_FMT_PAL8){
00244         int colors = 1 << depth;
00245 
00246         memset(p->data[1], 0, 1024);
00247 
00248         if(ihsize >= 36){
00249             int t;
00250             buf = buf0 + 46;
00251             t = bytestream_get_le32(&buf);
00252             if(t < 0 || t > (1 << depth)){
00253                 av_log(avctx, AV_LOG_ERROR, "Incorrect number of colors - %X for bitdepth %d\n", t, depth);
00254             }else if(t){
00255                 colors = t;
00256             }
00257         }
00258         buf = buf0 + 14 + ihsize; //palette location
00259         if((hsize-ihsize-14) < (colors << 2)){ // OS/2 bitmap, 3 bytes per palette entry
00260             for(i = 0; i < colors; i++)
00261                 ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf);
00262         }else{
00263             for(i = 0; i < colors; i++)
00264                 ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
00265         }
00266         buf = buf0 + hsize;
00267     }
00268     if(comp == BMP_RLE4 || comp == BMP_RLE8){
00269         if(height < 0){
00270             p->data[0] += p->linesize[0] * (avctx->height - 1);
00271             p->linesize[0] = -p->linesize[0];
00272         }
00273         bytestream2_init(&gb, buf, dsize);
00274         ff_msrle_decode(avctx, (AVPicture*)p, depth, &gb);
00275         if(height < 0){
00276             p->data[0] += p->linesize[0] * (avctx->height - 1);
00277             p->linesize[0] = -p->linesize[0];
00278         }
00279     }else{
00280         switch(depth){
00281         case 1:
00282             for (i = 0; i < avctx->height; i++) {
00283                 int j;
00284                 for (j = 0; j < n; j++) {
00285                     ptr[j*8+0] =  buf[j] >> 7;
00286                     ptr[j*8+1] = (buf[j] >> 6) & 1;
00287                     ptr[j*8+2] = (buf[j] >> 5) & 1;
00288                     ptr[j*8+3] = (buf[j] >> 4) & 1;
00289                     ptr[j*8+4] = (buf[j] >> 3) & 1;
00290                     ptr[j*8+5] = (buf[j] >> 2) & 1;
00291                     ptr[j*8+6] = (buf[j] >> 1) & 1;
00292                     ptr[j*8+7] =  buf[j]       & 1;
00293                 }
00294                 buf += n;
00295                 ptr += linesize;
00296             }
00297             break;
00298         case 8:
00299         case 24:
00300         case 32:
00301             for(i = 0; i < avctx->height; i++){
00302                 memcpy(ptr, buf, n);
00303                 buf += n;
00304                 ptr += linesize;
00305             }
00306             break;
00307         case 4:
00308             for(i = 0; i < avctx->height; i++){
00309                 int j;
00310                 for(j = 0; j < n; j++){
00311                     ptr[j*2+0] = (buf[j] >> 4) & 0xF;
00312                     ptr[j*2+1] = buf[j] & 0xF;
00313                 }
00314                 buf += n;
00315                 ptr += linesize;
00316             }
00317             break;
00318         case 16:
00319             for(i = 0; i < avctx->height; i++){
00320                 const uint16_t *src = (const uint16_t *) buf;
00321                 uint16_t *dst = (uint16_t *) ptr;
00322 
00323                 for(j = 0; j < avctx->width; j++)
00324                     *dst++ = av_le2ne16(*src++);
00325 
00326                 buf += n;
00327                 ptr += linesize;
00328             }
00329             break;
00330         default:
00331             av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
00332             return -1;
00333         }
00334     }
00335 
00336     *picture = s->picture;
00337     *got_frame = 1;
00338 
00339     return buf_size;
00340 }
00341 
00342 static av_cold int bmp_decode_end(AVCodecContext *avctx)
00343 {
00344     BMPContext* c = avctx->priv_data;
00345 
00346     if (c->picture.data[0])
00347         avctx->release_buffer(avctx, &c->picture);
00348 
00349     return 0;
00350 }
00351 
00352 AVCodec ff_bmp_decoder = {
00353     .name           = "bmp",
00354     .type           = AVMEDIA_TYPE_VIDEO,
00355     .id             = AV_CODEC_ID_BMP,
00356     .priv_data_size = sizeof(BMPContext),
00357     .init           = bmp_decode_init,
00358     .close          = bmp_decode_end,
00359     .decode         = bmp_decode_frame,
00360     .capabilities   = CODEC_CAP_DR1,
00361     .long_name      = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
00362 };