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swscale: try to use mmap only if available 

Some systems, e.g. Minix, have sys/mman.h defining MAP_ANONYMOUS without
providing (working) mmap and friends.  The mmx filter generation code
checks only for MAP_ANONYMOUS, not for availability of mmap itself which
leads to build errors on aforementioned systems.

This changes the conditional compilation to use mmap only if all the
required functions are available.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-10-13 16:00:16 +00:00
parent e98b02de5f
commit 95cd815c36
1 changed files with 5 additions and 3 deletions
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8
libswscale/utils.c
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@ -1018,6 +1018,8 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
}
}
#define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
/* precalculate horizontal scaler filter coefficients */
{
#if HAVE_MMXEXT_INLINE
@ -1028,7 +1030,7 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc,
NULL, NULL, NULL, 4);
#ifdef MAP_ANONYMOUS
#if USE_MMAP
c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
#elif HAVE_VIRTUALALLOC
@ -1051,7 +1053,7 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode,
c->hChrFilter, c->hChrFilterPos, 4);
#ifdef MAP_ANONYMOUS
#if USE_MMAP
mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);
mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);
#endif
@ -1630,7 +1632,7 @@ void sws_freeContext(SwsContext *c)
av_freep(&c->hChrFilterPos);
#if HAVE_MMX_INLINE
#ifdef MAP_ANONYMOUS
#if USE_MMAP
if (c->lumMmx2FilterCode)
munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);
if (c->chrMmx2FilterCode)