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Change linesize alignment method to ensure that linesize[0] == 2*linesize[1]

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for YUV420P and YUV422P always.
Fixes MPEG-2 4:2:2 encoding on PPC and ARM, and should fix mxf_d10 regression.

Originally committed as revision 18047 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-03-19 21:34:55 +00:00
parent b435725b4c
commit c9d6e84778
1 changed files with 9 additions and 1 deletions
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10
libavcodec/utils.c
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@ -242,6 +242,7 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
int h_chroma_shift, v_chroma_shift;
int size[4] = {0};
int tmpsize;
int unaligned;
AVPicture picture;
int stride_align[4];
@ -254,8 +255,14 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
h+= EDGE_WIDTH*2;
}
do {
// NOTE: do not align linesizes individually, this breaks e.g. assumptions
// that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
ff_fill_linesize(&picture, s->pix_fmt, w);
// increase alignment of w for next try (rhs gives the lowest bit set in w)
w += w & ~(w-1);
unaligned = 0;
for (i=0; i<4; i++){
//STRIDE_ALIGN is 8 for SSE* but this does not work for SVQ1 chroma planes
//we could change STRIDE_ALIGN to 16 for x86/sse but it would increase the
@ -267,8 +274,9 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
else
#endif
stride_align[i] = STRIDE_ALIGN;
picture.linesize[i] = ALIGN(picture.linesize[i], stride_align[i]);
unaligned |= picture.linesize[i] % stride_align[i];
}
} while (unaligned);
tmpsize = ff_fill_pointer(&picture, NULL, s->pix_fmt, h);
if (tmpsize < 0)