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authorMichael Walle <michael@walle.cc>2011-01-05 01:05:47 +0100
committermalc <av1474@comtv.ru>2011-01-12 18:36:22 +0300
commit00e076795f2d6dfa0c078ff5d5ee5d77190cb4b9 (patch)
tree125088eea53cc55083a5b69e927937b89db22645 /audio/mixeng.c
parent0f136d9e060ad879d0b840274ddfd1955e24fc10 (diff)
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audio: split sample conversion and volume mixing
Refactor the volume mixing, so it can be reused for capturing devices. Additionally, it removes superfluous multiplications with the nominal volume within the hardware voice code path. Signed-off-by: Michael Walle <michael@walle.cc> Signed-off-by: malc <av1474@comtv.ru>
Diffstat (limited to 'audio/mixeng.c')
-rw-r--r--audio/mixeng.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/audio/mixeng.c b/audio/mixeng.c
index 9f1d93f..4a9e8eb 100644
--- a/audio/mixeng.c
+++ b/audio/mixeng.c
@@ -333,3 +333,28 @@ void mixeng_clear (struct st_sample *buf, int len)
{
memset (buf, 0, len * sizeof (struct st_sample));
}
+
+void mixeng_volume (struct st_sample *buf, int len, struct mixeng_volume *vol)
+{
+#ifdef CONFIG_MIXEMU
+ if (vol->mute) {
+ mixeng_clear (buf, len);
+ return;
+ }
+
+ while (len--) {
+#ifdef FLOAT_MIXENG
+ buf->l = buf->l * vol->l;
+ buf->r = buf->r * vol->r;
+#else
+ buf->l = (buf->l * vol->l) >> 32;
+ buf->r = (buf->r * vol->r) >> 32;
+#endif
+ buf += 1;
+ }
+#else
+ (void) buf;
+ (void) len;
+ (void) vol;
+#endif
+}