From fa75a7b6d7af4b6c68329e1acdaced38a71d0dd8 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Tue, 10 Mar 2015 10:13:23 +0100
Subject: ao_coreaudio: move some helpers to utils

Needed by ao_coreaudio_exclusive.c in the next commit.
---
 audio/out/ao_coreaudio_utils.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'audio/out/ao_coreaudio_utils.c')

diff --git a/audio/out/ao_coreaudio_utils.c b/audio/out/ao_coreaudio_utils.c
index 90ebdbc752..64d98e5ece 100644
--- a/audio/out/ao_coreaudio_utils.c
+++ b/audio/out/ao_coreaudio_utils.c
@@ -22,6 +22,8 @@
  * on CoreAudio but not the AUHAL (such as using AudioQueue services).
  */
 
+#include <CoreAudio/HostTime.h>
+
 #include "audio/out/ao_coreaudio_utils.h"
 #include "audio/out/ao_coreaudio_properties.h"
 #include "osdep/timer.h"
@@ -214,3 +216,18 @@ void ca_print_asbd(struct ao *ao, const char *description,
     talloc_free(format);
 }
 
+int64_t ca_frames_to_us(struct ao *ao, uint32_t frames)
+{
+    return frames / (float) ao->samplerate * 1e6;
+}
+
+int64_t ca_get_latency(const AudioTimeStamp *ts)
+{
+    uint64_t out = AudioConvertHostTimeToNanos(ts->mHostTime);
+    uint64_t now = AudioConvertHostTimeToNanos(AudioGetCurrentHostTime());
+
+    if (now > out)
+        return 0;
+
+    return (out - now) * 1e-3;
+}
-- 
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