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avcodec/vp8dsp: zeroise input coefficient array after use in vp7 idct functions

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Signed-off-by: Peter Ross <pross@xvid.org>
Reviewed-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
pull/58/head
Peter Ross 11 years ago committed by Michael Niedermayer
parent c97c7c2adf
commit a707d18a48
1 changed files with 8 additions and 0 deletions
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  1. 8
      libavcodec/vp8dsp.c

8
libavcodec/vp8dsp.c
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@ -50,6 +50,10 @@ static void vp7_luma_dc_wht_c(int16_t block[4][4][16], int16_t dc[16])
b1 = (tmp[i + 0] - tmp[i + 8]) * 23170; b1 = (tmp[i + 0] - tmp[i + 8]) * 23170;
c1 = tmp[i + 4] * 12540 - tmp[i + 12] * 30274; c1 = tmp[i + 4] * 12540 - tmp[i + 12] * 30274;
d1 = tmp[i + 4] * 30274 + tmp[i + 12] * 12540; d1 = tmp[i + 4] * 30274 + tmp[i + 12] * 12540;
dc[i*4+0] = 0;
dc[i*4+1] = 0;
dc[i*4+2] = 0;
dc[i*4+3] = 0;
block[0][i][0] = (a1 + d1 + 0x20000) >> 18; block[0][i][0] = (a1 + d1 + 0x20000) >> 18;
block[3][i][0] = (a1 - d1 + 0x20000) >> 18; block[3][i][0] = (a1 - d1 + 0x20000) >> 18;
block[1][i][0] = (b1 + c1 + 0x20000) >> 18; block[1][i][0] = (b1 + c1 + 0x20000) >> 18;
@ -80,6 +84,10 @@ static void vp7_idct_add_c(uint8_t *dst, int16_t block[16], ptrdiff_t stride)
b1 = (block[i*4+0] - block[i*4+2]) * 23170; b1 = (block[i*4+0] - block[i*4+2]) * 23170;
c1 = block[i*4+1] * 12540 - block[i*4+3] * 30274; c1 = block[i*4+1] * 12540 - block[i*4+3] * 30274;
d1 = block[i*4+1] * 30274 + block[i*4+3] * 12540; d1 = block[i*4+1] * 30274 + block[i*4+3] * 12540;
block[i*4+0] = 0;
block[i*4+1] = 0;
block[i*4+2] = 0;
block[i*4+3] = 0;
tmp[i*4+0] = (a1 + d1) >> 14; tmp[i*4+0] = (a1 + d1) >> 14;
tmp[i*4+3] = (a1 - d1) >> 14; tmp[i*4+3] = (a1 - d1) >> 14;
tmp[i*4+1] = (b1 + c1) >> 14; tmp[i*4+1] = (b1 + c1) >> 14;

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