Work on improving PpbAudioConfig:RecommendSampleFrameCount

Add version 1.1 which will query the audio back end for the best available
sample frame count. Also add RecommendSampleRate.  Switch pepper plugin
delegate to use AUDIO_PCM_LOW_LATENCY if client request is compatible.

TEST=included
BUG=http://code.google.com/p/chromium/issues/detail?id=107572
Review URL: https://chromiumcodereview.appspot.com/9129007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@122653 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 5 insertions, 4 deletions

diff --git a/ppapi/examples/audio/audio.cc b/ppapi/examples/audio/audio.cc
index 2c01faf..e6a0a84 100644
--- a/ppapi/examples/audio/audio.cc
+++ b/ppapi/examples/audio/audio.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -56,7 +56,7 @@ class MyInstance : public pp::Instance {
 
     pp::AudioConfig config;
     sample_count_ = pp::AudioConfig::RecommendSampleFrameCount(
-        sample_rate_, kDefaultSampleCount);
+        this, sample_rate_, kDefaultSampleCount);
     config = pp::AudioConfig(this, sample_rate_, sample_count_);
     audio_ = pp::Audio(this, config, SineWaveCallbackTrampoline, this);
     return audio_.StartPlayback();
diff --git a/ppapi/examples/audio_input/audio_input.cc b/ppapi/examples/audio_input/audio_input.cc
index 74bc08e..203718e 100644
--- a/ppapi/examples/audio_input/audio_input.cc
+++ b/ppapi/examples/audio_input/audio_input.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -41,7 +41,8 @@ class MyInstance : public pp::Instance {
     const uint32_t kSampleCount = 1024;
     const uint32_t kChannelCount = 1;
 
-    sample_count_ = pp::AudioConfig::RecommendSampleFrameCount(kSampleFrequency,
+    sample_count_ = pp::AudioConfig::RecommendSampleFrameCount(this,
+                                                               kSampleFrequency,
                                                                kSampleCount);
     PP_DCHECK(sample_count_ > 0);
     channel_count_ = kChannelCount;