LCOV - code coverage report
Current view: top level - libavcodec - msrledec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 109 150 72.7 %
Date: 2017-12-16 13:57:32 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Microsoft RLE decoder
       3             :  * Copyright (C) 2008 Konstantin Shishkov
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       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.
      11             :  *
      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.
      16             :  *
      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
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * MS RLE decoder based on decoder by Mike Melanson and my own for TSCC
      25             :  * For more information about the MS RLE format, visit:
      26             :  *   http://www.multimedia.cx/msrle.txt
      27             :  */
      28             : 
      29             : #include "libavutil/intreadwrite.h"
      30             : #include "avcodec.h"
      31             : #include "msrledec.h"
      32             : 
      33           2 : static int msrle_decode_pal4(AVCodecContext *avctx, AVFrame *pic,
      34             :                              GetByteContext *gb)
      35             : {
      36             :     unsigned char rle_code;
      37             :     unsigned char extra_byte, odd_pixel;
      38             :     unsigned char stream_byte;
      39           2 :     int pixel_ptr = 0;
      40           2 :     int line = avctx->height - 1;
      41             :     int i;
      42             : 
      43         756 :     while (line >= 0 && pixel_ptr <= avctx->width) {
      44         754 :         if (bytestream2_get_bytes_left(gb) <= 0) {
      45           0 :             av_log(avctx, AV_LOG_ERROR,
      46             :                    "MS RLE: bytestream overrun, %dx%d left\n",
      47           0 :                    avctx->width - pixel_ptr, line);
      48           0 :             return AVERROR_INVALIDDATA;
      49             :         }
      50         754 :         rle_code = stream_byte = bytestream2_get_byteu(gb);
      51         754 :         if (rle_code == 0) {
      52             :             /* fetch the next byte to see how to handle escape code */
      53         138 :             stream_byte = bytestream2_get_byte(gb);
      54         138 :             if (stream_byte == 0) {
      55             :                 /* line is done, goto the next one */
      56         126 :                 line--;
      57         126 :                 pixel_ptr = 0;
      58          12 :             } else if (stream_byte == 1) {
      59             :                 /* decode is done */
      60           2 :                 return 0;
      61          10 :             } else if (stream_byte == 2) {
      62             :                 /* reposition frame decode coordinates */
      63           0 :                 stream_byte = bytestream2_get_byte(gb);
      64           0 :                 pixel_ptr += stream_byte;
      65           0 :                 stream_byte = bytestream2_get_byte(gb);
      66           0 :                 line -= stream_byte;
      67             :             } else {
      68             :                 // copy pixels from encoded stream
      69          10 :                 odd_pixel =  stream_byte & 1;
      70          10 :                 rle_code = (stream_byte + 1) / 2;
      71          10 :                 extra_byte = rle_code & 0x01;
      72          20 :                 if (pixel_ptr + 2*rle_code - odd_pixel > avctx->width ||
      73          10 :                     bytestream2_get_bytes_left(gb) < rle_code) {
      74           0 :                     av_log(avctx, AV_LOG_ERROR,
      75             :                            "MS RLE: frame/stream ptr just went out of bounds (copy)\n");
      76           0 :                     return AVERROR_INVALIDDATA;
      77             :                 }
      78             : 
      79         100 :                 for (i = 0; i < rle_code; i++) {
      80          90 :                     if (pixel_ptr >= avctx->width)
      81           0 :                         break;
      82          90 :                     stream_byte = bytestream2_get_byteu(gb);
      83          90 :                     pic->data[0][line * pic->linesize[0] + pixel_ptr] = stream_byte >> 4;
      84          90 :                     pixel_ptr++;
      85          90 :                     if (i + 1 == rle_code && odd_pixel)
      86           0 :                         break;
      87          90 :                     if (pixel_ptr >= avctx->width)
      88           0 :                         break;
      89          90 :                     pic->data[0][line * pic->linesize[0] + pixel_ptr] = stream_byte & 0x0F;
      90          90 :                     pixel_ptr++;
      91             :                 }
      92             : 
      93             :                 // if the RLE code is odd, skip a byte in the stream
      94          10 :                 if (extra_byte)
      95          10 :                     bytestream2_skip(gb, 1);
      96             :             }
      97             :         } else {
      98             :             // decode a run of data
      99         616 :             if (pixel_ptr + rle_code > avctx->width + 1) {
     100           0 :                 av_log(avctx, AV_LOG_ERROR,
     101             :                        "MS RLE: frame ptr just went out of bounds (run) %d %d %d\n", pixel_ptr, rle_code, avctx->width);
     102           0 :                 return AVERROR_INVALIDDATA;
     103             :             }
     104         616 :             stream_byte = bytestream2_get_byte(gb);
     105       16692 :             for (i = 0; i < rle_code; i++) {
     106       16204 :                 if (pixel_ptr >= avctx->width)
     107         128 :                     break;
     108       16076 :                 if ((i & 1) == 0)
     109        8102 :                     pic->data[0][line * pic->linesize[0] + pixel_ptr] = stream_byte >> 4;
     110             :                 else
     111        7974 :                     pic->data[0][line * pic->linesize[0] + pixel_ptr] = stream_byte & 0x0F;
     112       16076 :                 pixel_ptr++;
     113             :             }
     114             :         }
     115             :     }
     116             : 
     117             :     /* one last sanity check on the way out */
     118           0 :     if (bytestream2_get_bytes_left(gb)) {
     119           0 :         av_log(avctx, AV_LOG_ERROR,
     120             :                "MS RLE: ended frame decode with %d bytes left over\n",
     121             :                bytestream2_get_bytes_left(gb));
     122           0 :         return AVERROR_INVALIDDATA;
     123             :     }
     124             : 
     125           0 :     return 0;
     126             : }
     127             : 
     128             : 
     129         177 : static int msrle_decode_8_16_24_32(AVCodecContext *avctx, AVFrame *pic,
     130             :                                    int depth, GetByteContext *gb)
     131             : {
     132             :     uint8_t *output, *output_end;
     133         177 :     int p1, p2, line=avctx->height - 1, pos=0, i;
     134             :     uint16_t pix16;
     135             :     uint32_t pix32;
     136         177 :     unsigned int width= FFABS(pic->linesize[0]) / (depth >> 3);
     137             : 
     138         177 :     output     = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
     139         177 :     output_end = output + FFABS(pic->linesize[0]);
     140             : 
     141      130287 :     while (bytestream2_get_bytes_left(gb) > 0) {
     142      130110 :         p1 = bytestream2_get_byteu(gb);
     143      130110 :         if(p1 == 0) { //Escape code
     144       57908 :             p2 = bytestream2_get_byte(gb);
     145       57908 :             if(p2 == 0) { //End-of-line
     146        9161 :                 if (--line < 0) {
     147           0 :                     if (bytestream2_get_be16(gb) == 1) { // end-of-picture
     148           0 :                         return 0;
     149             :                     } else {
     150           0 :                         av_log(avctx, AV_LOG_ERROR,
     151             :                                "Next line is beyond picture bounds (%d bytes left)\n",
     152             :                                bytestream2_get_bytes_left(gb));
     153           0 :                         return AVERROR_INVALIDDATA;
     154             :                     }
     155             :                 }
     156        9161 :                 output = pic->data[0] + line * pic->linesize[0];
     157        9161 :                 output_end = output + FFABS(pic->linesize[0]);
     158        9161 :                 pos = 0;
     159        9161 :                 continue;
     160       48747 :             } else if(p2 == 1) { //End-of-picture
     161         176 :                 return 0;
     162       48571 :             } else if(p2 == 2) { //Skip
     163       13824 :                 p1 = bytestream2_get_byte(gb);
     164       13824 :                 p2 = bytestream2_get_byte(gb);
     165       13824 :                 line -= p2;
     166       13824 :                 pos += p1;
     167       13824 :                 if (line < 0 || pos >= width){
     168           0 :                     av_log(avctx, AV_LOG_ERROR, "Skip beyond picture bounds\n");
     169           0 :                     return -1;
     170             :                 }
     171       13824 :                 output = pic->data[0] + line * pic->linesize[0] + pos * (depth >> 3);
     172       13824 :                 output_end = pic->data[0] + line * pic->linesize[0] + FFABS(pic->linesize[0]);
     173       13824 :                 continue;
     174             :             }
     175             :             // Copy data
     176       34747 :             if (output + p2 * (depth >> 3) > output_end) {
     177           0 :                 bytestream2_skip(gb, 2 * (depth >> 3));
     178           0 :                 continue;
     179       34747 :             } else if (bytestream2_get_bytes_left(gb) < p2 * (depth >> 3)) {
     180           1 :                 av_log(avctx, AV_LOG_ERROR, "bytestream overrun\n");
     181           1 :                 return AVERROR_INVALIDDATA;
     182             :             }
     183             : 
     184       34746 :             if ((depth == 8) || (depth == 24)) {
     185        9473 :                 bytestream2_get_bufferu(gb, output, p2 * (depth >> 3));
     186        9473 :                 output += p2 * (depth >> 3);
     187             : 
     188             :                 // RLE8 copy is actually padded - and runs are not!
     189       18946 :                 if(depth == 8 && (p2 & 1)) {
     190        7144 :                     bytestream2_skip(gb, 1);
     191             :                 }
     192       25273 :             } else if (depth == 16) {
     193       59704 :                 for(i = 0; i < p2; i++) {
     194       52398 :                     *(uint16_t*)output = bytestream2_get_le16u(gb);
     195       52398 :                     output += 2;
     196             :                 }
     197       17967 :             } else if (depth == 32) {
     198      165584 :                 for(i = 0; i < p2; i++) {
     199      147617 :                     *(uint32_t*)output = bytestream2_get_le32u(gb);
     200      147617 :                     output += 4;
     201             :                 }
     202             :             }
     203       34746 :             pos += p2;
     204             :         } else { //run of pixels
     205             :             uint8_t pix[3]; //original pixel
     206       72202 :             if (output + p1 * (depth >> 3) > output_end)
     207           0 :                 continue;
     208             : 
     209       72202 :             switch(depth){
     210       11494 :             case  8:
     211       11494 :                 pix[0] = bytestream2_get_byte(gb);
     212       11494 :                 memset(output, pix[0], p1);
     213       11494 :                 output += p1;
     214       11494 :                 break;
     215       13994 :             case 16:
     216       13994 :                 pix16  = bytestream2_get_le16(gb);
     217      714834 :                 for(i = 0; i < p1; i++) {
     218      700840 :                         *(uint16_t*)output = pix16;
     219      700840 :                         output += 2;
     220             :                 }
     221       13994 :                 break;
     222           0 :             case 24:
     223           0 :                 pix[0] = bytestream2_get_byte(gb);
     224           0 :                 pix[1] = bytestream2_get_byte(gb);
     225           0 :                 pix[2] = bytestream2_get_byte(gb);
     226           0 :                 for(i = 0; i < p1; i++) {
     227           0 :                         *output++ = pix[0];
     228           0 :                         *output++ = pix[1];
     229           0 :                         *output++ = pix[2];
     230             :                 }
     231           0 :                 break;
     232       46714 :             case 32:
     233       46714 :                 pix32  = bytestream2_get_le32(gb);
     234     1616545 :                 for(i = 0; i < p1; i++) {
     235     1569831 :                         *(uint32_t*)output = pix32;
     236     1569831 :                         output += 4;
     237             :                 }
     238       46714 :                 break;
     239             :             }
     240       72202 :             pos += p1;
     241             :         }
     242             :     }
     243             : 
     244           0 :     av_log(avctx, AV_LOG_WARNING, "MS RLE warning: no end-of-picture code\n");
     245           0 :     return 0;
     246             : }
     247             : 
     248             : 
     249         179 : int ff_msrle_decode(AVCodecContext *avctx, AVFrame *pic,
     250             :                     int depth, GetByteContext *gb)
     251             : {
     252         179 :     switch(depth){
     253           2 :     case  4:
     254           2 :         return msrle_decode_pal4(avctx, pic, gb);
     255         177 :     case  8:
     256             :     case 16:
     257             :     case 24:
     258             :     case 32:
     259         177 :         return msrle_decode_8_16_24_32(avctx, pic, depth, gb);
     260           0 :     default:
     261           0 :         av_log(avctx, AV_LOG_ERROR, "Unknown depth %d\n", depth);
     262           0 :         return -1;
     263             :     }
     264             : }

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