[FFmpeg-devel] [PATCH 2/3] base64: optimize av_base64_encode()

[Michael Niedermayer]

This makes the code 2-3 times as fast

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
---
 libavutil/base64.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/libavutil/base64.c b/libavutil/base64.c
index a791a8e..80ab44b 100644
--- a/libavutil/base64.c
+++ b/libavutil/base64.c
@@ -26,6 +26,7 @@
 
 #include "common.h"
 #include "base64.h"
+#include "intreadwrite.h"
 
 /* ---------------- private code */
 static const uint8_t map2[] =
@@ -82,6 +83,15 @@ 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--;
-- 
1.7.5.4