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Support LZW and ZLIB compressed 4bpp tiff samples.

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Fixes ticket #439 and ticket #440.
This commit is contained in:
Carl Eugen Hoyos 2011-09-25 17:19:15 +02:00
parent baad01d8b4
commit ef8756dab2
1 changed files with 17 additions and 1 deletions
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18
libavcodec/tiff.c
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@ -129,6 +129,16 @@ static void av_always_inline horizontal_fill(unsigned int bpp, uint8_t* dst,
}
}
static void av_always_inline split_nibbles(uint8_t *dst, const uint8_t *src,
int width)
{
while (--width >= 0) {
// src == dst for LZW
dst[width * 2 + 1] = src[width] & 0xF;
dst[width * 2 + 0] = src[width] >> 4;
}
}
static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uint8_t *src, int size, int lines){
int c, line, pixels, code;
const uint8_t *ssrc = src;
@ -148,7 +158,11 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
}
src = zbuf;
for(line = 0; line < lines; line++){
memcpy(dst, src, width);
if(s->bpp == 4){
split_nibbles(dst, src, width);
}else{
memcpy(dst, src, width);
}
dst += stride;
src += width;
}
@ -238,6 +252,8 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
return -1;
}
if(s->bpp == 4)
split_nibbles(dst, dst, width);
break;
}
dst += stride;