From 40f6e2e041b7c0d690b1a22d4bb706feef991022 Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <stefano.pigozzi@gmail.com>
Date: Tue, 25 Jun 2013 08:24:14 +0200
Subject: ao_coreaudio: extract methods to lock/unlock device for digital
 output

---
 audio/out/ao_coreaudio_common.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

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

diff --git a/audio/out/ao_coreaudio_common.c b/audio/out/ao_coreaudio_common.c
index 1755004f3f..289fa93b64 100644
--- a/audio/out/ao_coreaudio_common.c
+++ b/audio/out/ao_coreaudio_common.c
@@ -310,3 +310,22 @@ static OSStatus ca_device_listener(AudioObjectID object, uint32_t n_addresses,
     return ca_property_listener(kAudioDevicePropertyDeviceHasChanged,
                                 object, n_addresses, addresses, data);
 }
+
+static OSStatus ca_lock_device(AudioDeviceID device, pid_t *pid) {
+    *pid = getpid();
+    OSStatus err = SetAudioProperty(device, kAudioDevicePropertyHogMode,
+                                    sizeof(*pid), pid);
+    if (err != noErr)
+        *pid = -1;
+
+    return err;
+}
+
+static OSStatus ca_unlock_device(AudioDeviceID device, pid_t *pid) {
+    if (*pid == getpid()) {
+        *pid = -1;
+        return SetAudioProperty(device, kAudioDevicePropertyHogMode,
+                                sizeof(*pid), &pid);
+    }
+    return noErr;
+}
-- 
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