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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef SDK_ANDROID_SRC_JNI_AUDIO_DEVICE_OPENSLES_COMMON_H_
#define SDK_ANDROID_SRC_JNI_AUDIO_DEVICE_OPENSLES_COMMON_H_
#include <SLES/OpenSLES.h>
#include <stddef.h>
#include "api/ref_counted_base.h"
#include "api/sequence_checker.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
namespace jni {
// Returns a string representation given an integer SL_RESULT_XXX code.
// The mapping can be found in <SLES/OpenSLES.h>.
const char* GetSLErrorString(size_t code);
// Configures an SL_DATAFORMAT_PCM structure based on native audio parameters.
SLDataFormat_PCM CreatePCMConfiguration(size_t channels,
int sample_rate,
size_t bits_per_sample);
// Helper class for using SLObjectItf interfaces.
template <typename SLType, typename SLDerefType>
class ScopedSLObject {
public:
ScopedSLObject() : obj_(nullptr) {}
~ScopedSLObject() { Reset(); }
SLType* Receive() {
RTC_DCHECK(!obj_);
return &obj_;
}
SLDerefType operator->() { return *obj_; }
SLType Get() const { return obj_; }
void Reset() {
if (obj_) {
(*obj_)->Destroy(obj_);
obj_ = nullptr;
}
}
private:
SLType obj_;
};
typedef ScopedSLObject<SLObjectItf, const SLObjectItf_*> ScopedSLObjectItf;
// Creates and realizes the main (global) Open SL engine object and returns
// a reference to it. The engine object is only created at the first call
// since OpenSL ES for Android only supports a single engine per application.
// Subsequent calls returns the already created engine.
// Note: This class must be used single threaded and this is enforced by a
// thread checker.
class OpenSLEngineManager : public rtc::RefCountedBase {
public:
OpenSLEngineManager();
~OpenSLEngineManager() override;
SLObjectItf GetOpenSLEngine();
private:
SequenceChecker thread_checker_;
// This object is the global entry point of the OpenSL ES API.
// After creating the engine object, the application can obtain this object‘s
// SLEngineItf interface. This interface contains creation methods for all
// the other object types in the API. None of these interface are realized
// by this class. It only provides access to the global engine object.
ScopedSLObjectItf engine_object_;
};
} // namespace jni
} // namespace webrtc
#endif // SDK_ANDROID_SRC_JNI_AUDIO_DEVICE_OPENSLES_COMMON_H_
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