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// 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_H_
#define PPAPI_CPP_AUDIO_H_
#include "ppapi/c/pp_stdint.h"
#include "ppapi/c/ppb_audio.h"
#include "ppapi/cpp/audio_config.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/resource.h"
/// @file
/// This file defines the API to create realtime stereo audio streaming
/// capabilities.
namespace pp {
/// An audio resource. Refer to the
/// <a href="/chrome/nativeclient/docs/audio.html">Pepper
/// Audio API Code Walkthrough</a> for information on using this interface.
class Audio : public Resource {
public:
/// An empty constructor for an Audio resource.
Audio() {}
/// A constructor that creates an Audio resource. No sound will be heard
/// until StartPlayback() is called. The callback is called with the buffer
/// address and given user data whenever the buffer needs to be filled.
/// From within the callback, you should not call PPB_Audio functions.
/// The callback will be called on a different thread than the one which
/// created the interface. For performance-critical applications (i.e.
/// low-latency audio), the callback should avoid blocking or calling
/// functions that can obtain locks, such as malloc. The layout and the size
/// of the buffer passed to the audio callback will be determined by
/// the device configuration and is specified in the AudioConfig
/// documentation.
///
/// @param[in] instance A pointer to an Instance indentifying one instance of
/// a module.
/// @param[in] config An AudioConfig containing the audio config resource.
/// @param[in] callback A PPB_Audio_Callback callback function that the
/// browser calls when it needs more samples to play.
/// @param[in] user_data A pointer to user data used in the callback function.
Audio(Instance* instance,
const AudioConfig& config,
PPB_Audio_Callback callback,
void* user_data);
/// Getter function for returning the internal PPB_AudioConfig struct
/// @return A mutable reference to the PPB_AudioConfig struct.
AudioConfig& config() { return config_; }
/// Getter function for returning the internal PPB_AudioConfig struct.
/// @return A const reference to the internal PPB_AudioConfig struct.
const AudioConfig& config() const { return config_; }
/// A function to start playback of audio.
bool StartPlayback();
/// A function to stop playback of audio.
bool StopPlayback();
private:
AudioConfig config_;
};
} // namespace pp
#endif // PPAPI_CPP_AUDIO_H_
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