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base64: optimize av_base64_encode()

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This makes the code 2-3 times as fast

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-20 22:46:14 +01:00
parent a41687c2d6
commit 112bca91b0
1 changed files with 10 additions and 0 deletions
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10
libavutil/base64.c
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@ -27,6 +27,7 @@
#include "common.h"
#include "base64.h"
#include "avassert.h"
#include "intreadwrite.h"
/* ---------------- private code */
static const uint8_t map2[] =
@ -85,6 +86,15 @@ char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
out_size < AV_BASE64_SIZE(in_size))
return NULL;
ret = dst = out;
while (bytes_remaining > 3) {
i_bits = AV_RB32(in);
in += 3; bytes_remaining -= 3;
*dst++ = b64[ i_bits>>26 ];
*dst++ = b64[(i_bits>>20) & 0x3F];
*dst++ = b64[(i_bits>>14) & 0x3F];
*dst++ = b64[(i_bits>>8 ) & 0x3F];
}
i_bits = 0;
while (bytes_remaining) {
i_bits = (i_bits << 8) + *in++;
bytes_remaining--;