From 0d34142f7e1509f2d8c896eb8cec90ed8c745d50 Mon Sep 17 00:00:00 2001 From: "Kevin P. Fleming" Date: Fri, 28 Oct 2005 16:20:44 +0000 Subject: add API function to perform volume adjustment on a frame of SLINEAR data documentation cleanup git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6874 65c4cc65-6c06-0410-ace0-fbb531ad65f3 --- frame.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'frame.c') diff --git a/frame.c b/frame.c index 5d9ddab11..7b4fa4ddf 100755 --- a/frame.c +++ b/frame.c @@ -1252,3 +1252,22 @@ int ast_codec_get_len(int format, int samples) return len; } + +int ast_frame_adjust_volume(struct ast_frame *f, int adjustment) +{ + int count; + short *fdata = f->data; + + if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR)) + return -1; + + for (count = 0; count < f->samples; count++) { + if (adjustment > 0) { + fdata[count] *= abs(adjustment); + } else if (adjustment < 0) { + fdata[count] /= abs(adjustment); + } + } + + return 0; +} -- cgit v1.2.3