On 2011-01-06 01:32, Alban Browaeys wrote:
From 853a4d96bf2624ef30f86cf4819382949d039c87 Mon Sep 17 00:00:00 2001
From: Alban Browaeys<pra...@yahoo.com>
Date: Wed, 5 Jan 2011 17:13:04 +0100
Subject: [PATCH] Implement Fortemedia SMA processing.
Those small array microphones returns two channels of opposite
phase thus the default remap in pulseaudio doing the sum output
silence.
Sounds very useful, but...
+void pa_fmaudiosma_run(pa_fmaudiosma *fs, const uint8_t *rec, uint8_t *out,
int n) {
+ unsigned i;
+
+ float *d, *s;
+ int n_frames = n / (sizeof(float) * 2);
+ memset(out, 0, n_frames * sizeof (float) * 2);
+
+ d = (float *)out;
+ s = (float *)rec;
+ for (i = n_frames; i> 0; i--, s += 2, d += 2)
+ d[0] = d[1] = s[0] - (s[0] + s[1]);
"s[0] - (s[0] + s[1])" can be simplified to "-s[1]", unless my junior
high math fails me completely. Are you sure you don't mean "s[0] - s[1]"?
--
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic
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