Move decision if we need to use WASAPI or wave out into separate function.

Minor Windows-only code cleanup. That also fixes broken sound on Windows Server 2003.

BUG=none

Review URL: http://codereview.chromium.org/8777003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112860 0039d316-1c4b-4281-b951-d872f2087c98

media/audio/audio_util.cc

@@ -243,7 +243,7 @@ double GetAudioHardwareSampleRate() {
     // Hardware sample-rate on the Mac can be configured, so we must query.
     return AUAudioOutputStream::HardwareSampleRate();
 #elif defined(OS_WIN)
-  if (base::win::GetVersion() <= base::win::VERSION_XP) {
+  if (!IsWASAPISupported()) {
     // Fall back to Windows Wave implementation on Windows XP or lower
     // and use 48kHz as default input sample rate.
     return 48000.0;
@@ -265,7 +265,7 @@ double GetAudioInputHardwareSampleRate() {
   // Hardware sample-rate on the Mac can be configured, so we must query.
   return AUAudioInputStream::HardwareSampleRate();
 #elif defined(OS_WIN)
-  if (base::win::GetVersion() <= base::win::VERSION_XP) {
+  if (!IsWASAPISupported()) {
     // Fall back to Windows Wave implementation on Windows XP or lower
     // and use 48kHz as default input sample rate.
     return 48000.0;
@@ -293,7 +293,7 @@ size_t GetAudioHardwareBufferSize() {
 #if defined(OS_MACOSX)
   return 128;
 #elif defined(OS_WIN)
-  if (base::win::GetVersion() <= base::win::VERSION_XP) {
+  if (!IsWASAPISupported()) {
     // Fall back to Windows Wave implementation on Windows XP or lower
     // and assume 48kHz as default sample rate.
     return 2048;
@@ -363,4 +363,14 @@ bool IsUnknownDataSize(base::SharedMemory* shared_memory,
   return actual_data_size == kUnknownDataSize;
 }
 
+#if defined(OS_WIN)
+
+bool IsWASAPISupported() {
+  // Note: that function correctly returns that Windows Server 2003 does not
+  // support WASAPI.
+  return base::win::GetVersion() >= base::win::VERSION_VISTA;
+}
+
+#endif
+
 }  // namespace media

media/audio/audio_util.h

@@ -105,6 +105,14 @@ MEDIA_EXPORT void SetUnknownDataSize(base::SharedMemory* shared_memory,
 MEDIA_EXPORT bool IsUnknownDataSize(base::SharedMemory* shared_memory,
                                     uint32 shared_memory_size);
 
+#if defined(OS_WIN)
+
+// Does Windows support WASAPI? We are checking in lot of places, and
+// sometimes check was written incorrectly, so move into separate function.
+MEDIA_EXPORT bool IsWASAPISupported();
+
+#endif  // defined(OS_WIN)
+
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_UTIL_H_

media/audio/win/audio_manager_win.cc

@@ -18,7 +18,7 @@
 #include "base/process_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
-#include "base/win/windows_version.h"
+#include "media/audio/audio_util.h"
 #include "media/audio/fake_audio_input_stream.h"
 #include "media/audio/fake_audio_output_stream.h"
 #include "media/audio/win/audio_low_latency_input_win.h"
@@ -100,7 +100,7 @@ static string16 GetDeviceAndDriverInfo(HDEVINFO device_info,
 
 AudioManagerWin::AudioManagerWin()
     : num_output_streams_(0) {
-  if (base::win::GetVersion() <= base::win::VERSION_XP) {
+  if (!media::IsWASAPISupported()) {
     // Use the Wave API for device enumeration if XP or lower.
     enumeration_type_ = kWaveEnumeration;
   } else {
@@ -141,7 +141,7 @@ AudioOutputStream* AudioManagerWin::MakeAudioOutputStream(
     return new PCMWaveOutAudioOutputStream(this, params, 3, WAVE_MAPPER);
   } else if (params.format == AudioParameters::AUDIO_PCM_LOW_LATENCY) {
     num_output_streams_++;
-    if (base::win::GetVersion() <= base::win::VERSION_XP) {
+    if (!media::IsWASAPISupported()) {
       // Fall back to Windows Wave implementation on Windows XP or lower.
       DLOG(INFO) << "Using WaveOut since WASAPI requires at least Vista.";
       return new PCMWaveOutAudioOutputStream(this, params, 2, WAVE_MAPPER);
@@ -167,7 +167,7 @@ AudioInputStream* AudioManagerWin::MakeAudioInputStream(
     return new PCMWaveInAudioInputStream(this, params, kNumInputBuffers,
                                          WAVE_MAPPER);
   } else if (params.format == AudioParameters::AUDIO_PCM_LOW_LATENCY) {
-    if (base::win::GetVersion() <= base::win::VERSION_XP) {
+    if (!media::IsWASAPISupported()) {
       // Fall back to Windows Wave implementation on Windows XP or lower.
       DLOG(INFO) << "Using WaveIn since WASAPI requires at least Vista.";
       // TODO(xians): Handle the non-default device.
@@ -272,7 +272,7 @@ bool AudioManagerWin::CanShowAudioInputSettings() {
 void AudioManagerWin::ShowAudioInputSettings() {
   std::wstring program;
   std::string argument;
-  if (base::win::GetVersion() <= base::win::VERSION_XP) {
+  if (!media::IsWASAPISupported()) {
     program = L"sndvol32.exe";
     argument = "-R";
   } else {