Finally distinguish TIFF_CCITT_RLE and TIFF_G3 1-D case, so both of them

will be decoded correctly.
This fixes issue 1423.

Originally committed as revision 20065 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/faxcompr.c

@@ -269,7 +269,7 @@ static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
 
 int ff_ccitt_unpack(AVCodecContext *avctx,
                        const uint8_t *src, int srcsize,
-                       uint8_t *dst, int height, int stride, enum TiffCompr compr)
+                       uint8_t *dst, int height, int stride, enum TiffCompr compr, int opts)
 {
     int j;
     GetBitContext gb;
@@ -293,9 +293,10 @@ int ff_ccitt_unpack(AVCodecContext *avctx,
                 return -1;
             }
         }else{
+            int g3d1 = (compr == TIFF_G3) && !(opts & 1);
             if(compr!=TIFF_CCITT_RLE && find_group3_syncmarker(&gb, srcsize*8) < 0)
                 break;
-            if(compr==TIFF_CCITT_RLE || get_bits1(&gb))
+            if(compr==TIFF_CCITT_RLE || g3d1 || get_bits1(&gb))
                 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, runend);
             else
                 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);

libavcodec/faxcompr.h

@@ -40,6 +40,6 @@ void ff_ccitt_unpack_init(void);
  */
 int ff_ccitt_unpack(AVCodecContext *avctx,
                        const uint8_t *src, int srcsize,
-                       uint8_t *dst, int height, int stride, enum TiffCompr compr);
+                       uint8_t *dst, int height, int stride, enum TiffCompr compr, int opts);
 
 #endif /* AVCODEC_FAXCOMPR_H */

libavcodec/tiff.c

@@ -146,13 +146,11 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
                 src2[i] = ff_reverse[src[i]];
         }
         memset(src2+size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
-        if(s->compr == TIFF_G3 && !(s->fax_opts & 1))
-            s->compr = TIFF_CCITT_RLE;
         switch(s->compr){
         case TIFF_CCITT_RLE:
         case TIFF_G3:
         case TIFF_G4:
-            ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride, s->compr);
+            ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride, s->compr, s->fax_opts);
             break;
         }
         av_free(src2);