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blackfin: fix yuv422 to yuv420 conversion

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The old code is correct only when stride = 2*width.

Patch by Ronaldo Moura <ronaldo d moura monity com br>


backport r31142 by mru


Originally committed as revision 23212 to svn://svn.ffmpeg.org/ffmpeg/branches/0.6
This commit is contained in:
Ronaldo Moura 2010-05-21 18:05:38 +00:00 committed by Reinhard Tartler
parent b50601e882
commit 37a0852009
1 changed files with 12 additions and 5 deletions
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17
libswscale/bfin/internal_bfin.S
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@ -479,9 +479,6 @@ DEFUN(uyvytoyv12, mL3, (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8
r1 = [fp + ARG_srcStride];
r2 = r0 + r1;
r1 += -8; // i0,i1 is pre read need to correct
m0 = r1;
i0 = r0; // uyvy_T even
i1 = r2; // uyvy_B odd
@ -494,6 +491,12 @@ DEFUN(uyvytoyv12, mL3, (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8
p4 = p4 >> 1;
p5 = p5 >> 2;
r2 = r0 << 1;
r1 = r1 << 1;
r1 = r1 - r2; // srcStride + (srcStride - 2*width)
r1 += -8; // i0,i1 is pre read need to correct
m0 = r1;
r2 = [fp + ARG_chromStride];
r0 = r0 >> 1;
r2 = r2 - r0;
@ -549,8 +552,6 @@ DEFUN(yuyvtoyv12, mL3, (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8
r1 = [fp + ARG_srcStride];
r2 = r0 + r1;
r1 += -8; // i0,i1 is pre read need to correct
m0 = r1;
i0 = r0; // uyvy_T even
i1 = r2; // uyvy_B odd
@ -564,6 +565,12 @@ DEFUN(yuyvtoyv12, mL3, (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8
p4 = p4 >> 1;
p5 = p5 >> 2;
r2 = r0 << 1;
r1 = r1 << 1;
r1 = r1 - r2; // srcStride + (srcStride - 2*width)
r1 += -8; // i0,i1 is pre read need to correct
m0 = r1;
r2 = [fp + ARG_chromStride];
r0 = r0 >> 1;
r2 = r2 - r0;