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Code Issues Releases Activity

dsputil: set STRIDE_ALIGN to 16 for x86 also.

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This fixes crashes in e.g. PNG decoding with SSE2 enabled. In fact, many
x86 optimizations for codecs assume that our buffer strides are 16-byte
aligned.
This commit is contained in:
Ronald S. Bultje 2012-02-07 14:54:46 -08:00
parent 4ff6dea390
commit 9b027c0d07
2 changed files with 2 additions and 28 deletions
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18
libavcodec/dsputil.h
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@ -655,23 +655,9 @@ void ff_intrax8dsp_init(DSPContext* c, AVCodecContext *avctx);
void ff_mlp_init(DSPContext* c, AVCodecContext *avctx);
void ff_mlp_init_x86(DSPContext* c, AVCodecContext *avctx);
#if ARCH_ARM
#if HAVE_NEON
#if (ARCH_ARM && HAVE_NEON) || ARCH_PPC || HAVE_MMI || HAVE_MMX
# define STRIDE_ALIGN 16
#endif
#elif ARCH_PPC
#define STRIDE_ALIGN 16
#elif HAVE_MMI
#define STRIDE_ALIGN 16
#endif
#ifndef STRIDE_ALIGN
#else
# define STRIDE_ALIGN 8
#endif

12
libavcodec/utils.c
View File

@ -234,18 +234,6 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
for (i = 0; i < 4; i++)
linesize_align[i] = STRIDE_ALIGN;
//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
//picture size unneccessarily in some cases. The solution here is not
//pretty and better ideas are welcome!
#if HAVE_MMX
if(s->codec_id == CODEC_ID_SVQ1 || s->codec_id == CODEC_ID_VP5 ||
s->codec_id == CODEC_ID_VP6 || s->codec_id == CODEC_ID_VP6F ||
s->codec_id == CODEC_ID_VP6A) {
for (i = 0; i < 4; i++)
linesize_align[i] = 16;
}
#endif
}
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){