* along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
- * the C code (not assembly, mmx, ...) of this file can be used
- * under the LGPL license too
+ * The C code (not assembly, mmx, ...) of this file can be used
+ * under the LGPL license.
*/
#include <stddef.h>
#include <inttypes.h> /* for __WORDSIZE */
#ifndef __WORDSIZE
-// #warning You have misconfigured system and probably will lose performance!
+// #warning You have a misconfigured system and will probably lose performance!
#define __WORDSIZE MP_WORDSIZE
#endif
#endif
#ifdef HAVE_3DNOW
-/* On K6 femms is faster of emms. On K7 femms is directly mapped on emms. */
+/* On K6 femms is faster than emms. On K7 femms is directly mapped on emms. */
#define EMMS "femms"
#else
#define EMMS "emms"
Original by Strepto/Astral
ported to gcc & bugfixed : A'rpi
MMX2, 3DNOW optimization by Nick Kurshev
- 32bit c version, and and&add trick by Michael Niedermayer
+ 32 bit C version, and and&add trick by Michael Niedermayer
*/
static inline void RENAME(rgb15to16)(const uint8_t *src,uint8_t *dst,long src_size)
{
end = s + src_size;
#ifdef HAVE_MMX
mm_end = end - 15;
-#if 1 //is faster only if multiplies are reasonable fast (FIXME figure out on which CPUs this is faster, on Athlon it is slightly faster)
+#if 1 //is faster only if multiplies are reasonably fast (FIXME figure out on which CPUs this is faster, on Athlon it is slightly faster)
asm volatile(
"movq %3, %%mm5 \n\t"
"movq %4, %%mm6 \n\t"
end = s + src_size;
#ifdef HAVE_MMX
mm_end = end - 15;
-#if 1 //is faster only if multiplies are reasonable fast (FIXME figure out on which CPUs this is faster, on Athlon it is slightly faster)
+#if 1 //is faster only if multiplies are reasonably fast (FIXME figure out on which CPUs this is faster, on Athlon it is slightly faster)
asm volatile(
"movq %3, %%mm5 \n\t"
"movq %4, %%mm6 \n\t"
}
/*
- I use here less accurate approximation by simply
- left-shifting the input
- value and filling the low order bits with
- zeroes. This method improves png's
- compression but this scheme cannot reproduce white exactly, since it does not
- generate an all-ones maximum value; the net effect is to darken the
+ I use less accurate approximation here by simply left-shifting the input
+ value and filling the low order bits with zeroes. This method improves PNG
+ compression but this scheme cannot reproduce white exactly, since it does
+ not generate an all-ones maximum value; the net effect is to darken the
image slightly.
The better method should be "left bit replication":
#endif
while (s < end)
{
-#if 0 //slightly slower on athlon
+#if 0 //slightly slower on Athlon
int bgr= *s++;
*((uint32_t*)d)++ = ((bgr&0x1F)<<3) + ((bgr&0x3E0)<<6) + ((bgr&0x7C00)<<9);
#else
for (y=0; y<height; y++)
{
#ifdef HAVE_MMX
-//FIXME handle 2 lines a once (fewer prefetch, reuse some chrom, but very likely limited by mem anyway)
+//FIXME handle 2 lines at once (fewer prefetches, reuse some chroma, but very likely memory-limited anyway)
asm volatile(
"xor %%"REG_a", %%"REG_a" \n\t"
ASMALIGN(4)
}
/**
- *
- * height should be a multiple of 2 and width should be a multiple of 16 (if this is a
- * problem for anyone then tell me, and ill fix it)
+ * Height should be a multiple of 2 and width should be a multiple of 16 (if
+ * this is a problem for anyone then tell me, and I will fix it).
*/
static inline void RENAME(yv12toyuy2)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
long width, long height,
for (y=0; y<height; y++)
{
#ifdef HAVE_MMX
-//FIXME handle 2 lines a once (fewer prefetch, reuse some chrom, but very likely limited by mem anyway)
+//FIXME handle 2 lines at once (fewer prefetches, reuse some chroma, but very likely memory-limited anyway)
asm volatile(
"xor %%"REG_a", %%"REG_a" \n\t"
ASMALIGN(4)
: "%"REG_a
);
#else
-//FIXME adapt the alpha asm code from yv12->yuy2
+//FIXME adapt the Alpha ASM code from yv12->yuy2
#if __WORDSIZE >= 64
int i;
}
/**
- *
- * height should be a multiple of 2 and width should be a multiple of 16 (if this is a
- * problem for anyone then tell me, and ill fix it)
+ * Height should be a multiple of 2 and width should be a multiple of 16 (if
+ * this is a problem for anyone then tell me, and I will fix it).
*/
static inline void RENAME(yv12touyvy)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
long width, long height,
}
/**
- *
- * width should be a multiple of 16
+ * Width should be a multiple of 16.
*/
static inline void RENAME(yuv422ptoyuy2)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
long width, long height,
}
/**
- *
- * height should be a multiple of 2 and width should be a multiple of 16 (if this is a
- * problem for anyone then tell me, and ill fix it)
+ * Height should be a multiple of 2 and width should be a multiple of 16 (if
+ * this is a problem for anyone then tell me, and I will fix it).
*/
static inline void RENAME(yuy2toyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
long width, long height,
}
/**
- *
- * height should be a multiple of 2 and width should be a multiple of 16 (if this is a
- * problem for anyone then tell me, and ill fix it)
- * chrominance data is only taken from every secound line others are ignored FIXME write HQ version
+ * Height should be a multiple of 2 and width should be a multiple of 16 (if
+ * this is a problem for anyone then tell me, and I will fix it).
+ * Chrominance data is only taken from every secound line, others are ignored.
+ * FIXME: Write HQ version.
*/
static inline void RENAME(uyvytoyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
long width, long height,
}
/**
- *
- * height should be a multiple of 2 and width should be a multiple of 2 (if this is a
- * problem for anyone then tell me, and ill fix it)
- * chrominance data is only taken from every secound line others are ignored in the C version FIXME write HQ version
+ * Height should be a multiple of 2 and width should be a multiple of 2 (if
+ * this is a problem for anyone then tell me, and I will fix it).
+ * Chrominance data is only taken from every secound line,
+ * others are ignored in the C version.
+ * FIXME: Write HQ version.
*/
static inline void RENAME(rgb24toyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
long width, long height,
projects / platform / upstream / libav.git / commitdiff