From 1626408838eb480cbb53c8789711d7cdc56b495c Mon Sep 17 00:00:00 2001
From: Luo Jinghua <sunmoon1997@gmail.com>
Date: Fri, 21 Dec 2012 15:03:17 +0800
Subject: if no buffer is queued, then wait for one

---
 src/device_mixer.cpp | 21 +++++++++++++++++----
 src/device_mixer.h   |  2 +-
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/src/device_mixer.cpp b/src/device_mixer.cpp
index ed10ab5..0a446c2 100644
--- a/src/device_mixer.cpp
+++ b/src/device_mixer.cpp
@@ -348,7 +348,7 @@ namespace audiere {
       return 0;
 
     while (m_free_list.empty()) {
-      m_buffer_cond.wait(m_buffer_mutex, 10);
+      m_buffer_cond.wait(m_buffer_mutex, 1);
       if (m_shutdown)
         return 0;
     }
@@ -376,23 +376,35 @@ namespace audiere {
     if (m_shutdown)
       return false;
 
+    bool donotify = m_queue.empty();
     while (m_queue.size() >= size_t(m_max_queue_len)) {
-      m_cond.wait(m_mutex, 10);
+      m_cond.wait(m_mutex, 1);
       if (m_shutdown)
         return false;
     }
 
     m_queue.push_back(buffer);
+    if (donotify)
+      m_cond.notify();
     return true;
   }
 
-  AudioBuffer*  AudioQueue::pop()
+  AudioBuffer*  AudioQueue::pop(bool wait)
   {
     SYNCHRONIZED(m_mutex);
 
-    if (m_shutdown || m_queue.empty())
+    if (m_shutdown)
+      return 0;
+
+    if (!wait && m_queue.empty())
       return 0;
 
+    while (m_queue.empty()) {
+      m_cond.wait(m_mutex, 1);
+      if (m_shutdown)
+        return 0;
+    }
+
     bool donotify = m_queue.size() >= size_t(m_max_queue_len);
 
     AudioBuffer* buf = m_queue.front();
@@ -408,6 +420,7 @@ namespace audiere {
 
     m_shutdown = true;
     m_cond.notify();
+    m_buffer_cond.notify();
   }
 
   ThreadedMixerDevice::ThreadedMixerDevice(int rate, int block_size, int queue_len)
diff --git a/src/device_mixer.h b/src/device_mixer.h
index 942bccc..43c5c4f 100644
--- a/src/device_mixer.h
+++ b/src/device_mixer.h
@@ -120,7 +120,7 @@ namespace audiere {
     void put_buffer(AudioBuffer* buffer);
 
     bool push(AudioBuffer* buffer);
-    AudioBuffer* pop();
+    AudioBuffer* pop(bool wait = true);
 
     void shutdown();
 
-- 
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