add some code optimizations, see the report for an explanation

(issue #7105, Mithraen)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@29018 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 9 insertions, 8 deletions

diff --git a/codecs/codec_ulaw.c b/codecs/codec_ulaw.c
index 41eb5b308..d4f753304 100644
--- a/codecs/codec_ulaw.c
+++ b/codecs/codec_ulaw.c
@@ -54,17 +54,17 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 /*! \brief convert and store samples in outbuf */
 static int ulawtolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
 {
-	int i;
+	int i = f->samples;
 	unsigned char *src = f->data;
-	int16_t *dst = (int16_t *)pvt->outbuf;
+	int16_t *dst = (int16_t *)pvt->outbuf + pvt->samples;
 	int in_samples = f->samples;
 	int out_samples = pvt->samples;
 
 	/* convert and copy in outbuf */
-	for (i = 0; i < in_samples; i++)
-		dst[out_samples++] = AST_MULAW(src[i]);
+	while (i--)
+		*dst++ = AST_MULAW(*src++);
 
-	pvt->samples = out_samples;
+	pvt->samples += in_samples;
 	pvt->datalen += in_samples * 2;	/* 2 bytes/sample */
 	return 0;
 }
@@ -72,13 +72,14 @@ static int ulawtolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
 /*! \brief convert and store samples in outbuf */
 static int lintoulaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
 {
-	int i;
+	int i = f->samples;
 	char *dst = pvt->outbuf + pvt->samples;
 	int16_t *src = f->data;
 	int in_samples = f->samples;
 
-	for (i = 0; i < in_samples; i++) 
-		*dst++ = AST_LIN2MU(src[i]);
+	while (i--)
+		*dst++ = AST_LIN2MU(*src++);
+
 	pvt->samples += in_samples;
 	pvt->datalen += in_samples;	/* 1 byte/sample */
 	return 0;