From 4c91f355e83c0091c05ddeea7a85788db6fe3ee3 Mon Sep 17 00:00:00 2001
From: Luo Jinghua <sunmoon1997@gmail.com>
Date: Tue, 26 Oct 2010 16:43:25 +0800
Subject: alsa: don't hardcode sample rate and buffer size

---
 src/device_alsa.cpp | 20 ++++++++++++--------
 src/device_alsa.h   |  8 ++++----
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/src/device_alsa.cpp b/src/device_alsa.cpp
index b727825..5a8652f 100644
--- a/src/device_alsa.cpp
+++ b/src/device_alsa.cpp
@@ -11,7 +11,8 @@
 namespace audiere {
 
   static snd_pcm_t* openDevice(const std::string &name,
-			       unsigned int rate) {
+			       unsigned int &rate,
+			       unsigned int &bufsz) {
     int status = 0;
     snd_pcm_t* pcm_handle = 0;
 
@@ -148,6 +149,7 @@ namespace audiere {
       return 0;
     }
 
+    bufsz = period_size * channels * 2;
     return pcm_handle;
   }
 
@@ -160,15 +162,15 @@ namespace audiere {
     if (default_device != devices[0])
       devices[0] = default_device;
 
-    int i, rate;
+    unsigned int i, rate, buffer_size;
     snd_pcm_t* pcm_handle = 0;
 
     for (i = 0; devices[i].length() > 0; i++) {
       rate = 48000;
-      pcm_handle = openDevice(devices[i], rate);
+      pcm_handle = openDevice(devices[i], rate, buffer_size);
       if (!pcm_handle) {
 	rate = 44100;
-	pcm_handle = openDevice(devices[i], rate);
+	pcm_handle = openDevice(devices[i], rate, buffer_size);
       }
       if (pcm_handle)
 	break;
@@ -178,14 +180,14 @@ namespace audiere {
       return 0;
     }
 
-    return new ALSAAudioDevice(pcm_handle, devices[i], rate, 4096);
+    return new ALSAAudioDevice(pcm_handle, devices[i], rate, buffer_size);
   }
 
 
   ALSAAudioDevice::ALSAAudioDevice(snd_pcm_t* pcm_handle,
 				   const std::string &name,
-                                   int rate,
-                                   int buffer_size)
+                                   unsigned int rate,
+                                   unsigned int buffer_size)
     : MixerDevice(rate), m_pcm_name(name), m_rate(rate)
   {
     m_pcm_handle = pcm_handle;
@@ -214,11 +216,13 @@ namespace audiere {
 
     // reopen a pcm
     if (!m_pcm_handle) {
-      m_pcm_handle = openDevice(m_pcm_name, m_rate);
+      m_pcm_handle = openDevice(m_pcm_name, m_rate, m_buffer_size);
       if (!m_pcm_handle) {
 	usleep(100);
 	return;
       }
+      delete [] m_buffer;
+      m_buffer = new char [m_buffer_size];
     }
 
     sample_buf = m_buffer;
diff --git a/src/device_alsa.h b/src/device_alsa.h
index b93383e..a4e3289 100644
--- a/src/device_alsa.h
+++ b/src/device_alsa.h
@@ -16,8 +16,8 @@ namespace audiere {
   private:
     ALSAAudioDevice(snd_pcm_t* pcm_handle,
 		    const std::string &name,
-		    int rate,
-		    int buffer_size);
+		    unsigned int rate,
+		    unsigned int buffer_size);
     ~ALSAAudioDevice();
 
   public:
@@ -26,10 +26,10 @@ namespace audiere {
 
   private:
     snd_pcm_t* m_pcm_handle;
-    int m_buffer_size;
+    unsigned int m_buffer_size;
     char* m_buffer;
     std::string m_pcm_name;
-    int m_rate;
+    unsigned int m_rate;
   };
 
 }
-- 
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