Move ppapi audio interface out of dev, but

for this CL, also keep the old dev interface
around temporarily, to avoid tree breakage.
Add sample_rate to RecommendSampleFrameCount() to the
non-dev audio interface. Currently ignored, but useful
information to use when we need to refine RecommendSampleFrameCount()

Review URL: http://codereview.chromium.org/6279003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71527 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 61 insertions, 0 deletions

diff --git a/ppapi/cpp/audio_config.h b/ppapi/cpp/audio_config.h
new file mode 100644
index 0000000..82d8b97
--- /dev/null
+++ b/ppapi/cpp/audio_config.h
@@ -0,0 +1,61 @@
+// Copyright (c) 2011 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.
+
+#ifndef PPAPI_CPP_AUDIO_CONFIG_H_
+#define PPAPI_CPP_AUDIO_CONFIG_H_
+
+#include "ppapi/c/ppb_audio_config.h"
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/cpp/resource.h"
+
+namespace pp {
+
+class Instance;
+
+// Typical usage:
+//
+//   // Create an audio config with a supported frame count.
+//   uint32_t sample_frame_count = AudioConfig::RecommendSampleFrameCount(
+//       PP_AUDIOSAMPLERATE_44100, 4096);
+//   AudioConfig config(PP_AUDIOSAMPLERATE_44100, sample_frame_count);
+//   if (config.is_null())
+//     return false;  // Couldn't configure audio.
+//
+//   // Then use the config to create your audio resource.
+//   Audio audio(..., config, ...);
+//   if (audio.is_null())
+//     return false;  // Couldn't create audio.
+class AudioConfig : public Resource {
+ public:
+  AudioConfig();
+
+  // Creates an audio config based on the given sample rate and frame count.
+  // If the rate and frame count aren't supported, the resulting resource
+  // will be is_null(). Pass the result of RecommendSampleFrameCount as the
+  // sample frame count.
+  //
+  // See PPB_AudioConfig.CreateStereo16Bit for more.
+  AudioConfig(Instance* instance,
+              PP_AudioSampleRate sample_rate,
+              uint32_t sample_frame_count);
+
+  // Returns a supported frame count for use in the constructor.
+  //
+  // See PPB_AudioConfig.RecommendSampleFrameCount.
+  static uint32_t RecommendSampleFrameCount(
+      PP_AudioSampleRate sample_rate,
+      uint32_t requested_sample_frame_count);
+
+  PP_AudioSampleRate sample_rate() const { return sample_rate_; }
+  uint32_t sample_frame_count() { return sample_frame_count_; }
+
+ private:
+  PP_AudioSampleRate sample_rate_;
+  uint32_t sample_frame_count_;
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_AUDIO_CONFIG_H_
+