audio_manager_cras: Set minimum output buffer size per board

media/audio/cras/audio_manager_cras.cc

Index: media/audio/cras/audio_manager_cras.cc
diff --git a/media/audio/cras/audio_manager_cras.cc b/media/audio/cras/audio_manager_cras.cc
index 65a2f66d43d228d2856ca1242c3e62bd46d94889..f39083785eeecfac7fb7d25fdc14d9b90a0e0112 100644
--- a/media/audio/cras/audio_manager_cras.cc
+++ b/media/audio/cras/audio_manager_cras.cc
@@ -7,6 +7,7 @@
 #include <stddef.h>
 
 #include <algorithm>
+#include <map>
 
 #include "base/command_line.h"
 #include "base/environment.h"
@@ -16,6 +17,7 @@
 #include "base/nix/xdg_util.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/sys_info.h"
 #include "chromeos/audio/audio_device.h"
 #include "chromeos/audio/cras_audio_handler.h"
 #include "media/audio/audio_device_description.h"
@@ -43,6 +45,11 @@ const int kDefaultSampleRate = 48000;
 const int kMinimumOutputBufferSize = 512;
 const int kMaximumOutputBufferSize = 8192;
 
+// Boards with customized minimum output buffer size.
+const std::map<std::string, int> kCustomizedOutputBufferSizeMap = {

[DaleCurtis, 2017/03/30 16:17:42]

This is a static initializer, you should instead just code these values in the
function.

[cychiang, 2017/04/07 08:45:41]

Done.

+    {"samus", 256},
+    {"kevin", 768}};
+
 // Default input buffer size.
 const int kDefaultInputBufferSize = 1024;
 
@@ -265,12 +272,21 @@ AudioInputStream* AudioManagerCras::MakeLowLatencyInputStream(
   return MakeInputStream(params, device_id);
 }
 
+int AudioManagerCras::GetMinimumOutputBufferSizePerBoard() {
+  std::string board = base::SysInfo::GetLsbReleaseBoard();
+  if (kCustomizedOutputBufferSizeMap.find(board) !=
+      kCustomizedOutputBufferSizeMap.end()) {
+    return kCustomizedOutputBufferSizeMap.at(board);
+  }
+  return kMinimumOutputBufferSize;
+}
+
 AudioParameters AudioManagerCras::GetPreferredOutputStreamParameters(
     const std::string& output_device_id,
     const AudioParameters& input_params) {
   ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
   int sample_rate = kDefaultSampleRate;
-  int buffer_size = kMinimumOutputBufferSize;
+  int buffer_size = GetMinimumOutputBufferSizePerBoard();
   int bits_per_sample = 16;
   if (input_params.IsValid()) {
     sample_rate = input_params.sample_rate();