mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-01 08:42:13 +00:00
056be6c1ac
To add a non-native input source in the MediaTrackGraph, we need a input-only cubeb stream. This patch implements a light-weight wrapper to operate the C style Cubeb APIs in a C++-friendly way. Depends on D143101 Differential Revision: https://phabricator.services.mozilla.com/D116535
82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef DOM_MEDIA_CUBEBINPUTSTREAM_H_
|
|
#define DOM_MEDIA_CUBEBINPUTSTREAM_H_
|
|
|
|
#include "CubebUtils.h"
|
|
#include "mozilla/Maybe.h"
|
|
#include "mozilla/RefPtr.h"
|
|
#include "mozilla/UniquePtr.h"
|
|
#include "nsISupportsImpl.h"
|
|
|
|
namespace mozilla {
|
|
|
|
// A light-weight wrapper to operate the C style Cubeb APIs for an input-only
|
|
// audio stream in a C++-friendly way.
|
|
// Limitation: Do not call these APIs in an audio callback thread. Otherwise we
|
|
// may get a deadlock.
|
|
class CubebInputStream final {
|
|
public:
|
|
~CubebInputStream() = default;
|
|
|
|
class Listener {
|
|
public:
|
|
NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING;
|
|
|
|
// This will be fired on audio callback thread.
|
|
virtual long DataCallback(const void* aBuffer, long aFrames) = 0;
|
|
// This can be fired on any thread.
|
|
virtual void StateCallback(cubeb_state aState) = 0;
|
|
// This can be fired on any thread.
|
|
virtual void DeviceChangedCallback() = 0;
|
|
|
|
protected:
|
|
Listener() = default;
|
|
virtual ~Listener() = default;
|
|
};
|
|
|
|
// Return a non-null pointer if the stream has been initialized
|
|
// successfully. Otherwise return a null pointer.
|
|
static UniquePtr<CubebInputStream> Create(cubeb_devid aDeviceId,
|
|
uint32_t aChannels, uint32_t aRate,
|
|
bool aIsVoice, Listener* aListener);
|
|
|
|
// Start producing audio data.
|
|
int Start();
|
|
|
|
// Stop producing audio data.
|
|
int Stop();
|
|
|
|
private:
|
|
struct CubebDestroyPolicy {
|
|
void operator()(cubeb_stream* aStream) const;
|
|
};
|
|
CubebInputStream(already_AddRefed<Listener>&& aListener,
|
|
UniquePtr<cubeb_stream, CubebDestroyPolicy>&& aStream);
|
|
|
|
void Init();
|
|
|
|
template <typename Function, typename... Args>
|
|
int InvokeCubeb(Function aFunction, Args&&... aArgs);
|
|
|
|
// Static wrapper function cubeb callbacks.
|
|
static long DataCallback_s(cubeb_stream* aStream, void* aUser,
|
|
const void* aInputBuffer, void* aOutputBuffer,
|
|
long aFrames);
|
|
static void StateCallback_s(cubeb_stream* aStream, void* aUser,
|
|
cubeb_state aState);
|
|
static void DeviceChangedCallback_s(void* aUser);
|
|
|
|
// mListener must outlive the life time of the mStream.
|
|
const RefPtr<Listener> mListener;
|
|
const UniquePtr<cubeb_stream, CubebDestroyPolicy> mStream;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // DOM_MEDIA_CUBEBINPUTSTREAM_H_
|