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/*
* Copyright (c) 2020 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 AUDIO_CHANNEL_RECEIVE_FRAME_TRANSFORMER_DELEGATE_H_
#define AUDIO_CHANNEL_RECEIVE_FRAME_TRANSFORMER_DELEGATE_H_
#include <memory>
#include "api/frame_transformer_interface.h"
#include "api/sequence_checker.h"
#include "rtc_base/system/no_unique_address.h"
#include "rtc_base/task_queue.h"
#include "rtc_base/thread.h"
namespace webrtc {
// Delegates calls to FrameTransformerInterface to transform frames, and to
// ChannelReceive to receive the transformed frames using the
// |receive_frame_callback_| on the |channel_receive_thread_|.
class ChannelReceiveFrameTransformerDelegate : public TransformedFrameCallback {
public:
using ReceiveFrameCallback =
std::function<void(rtc::ArrayView<const uint8_t> packet,
const RTPHeader& header)>;
ChannelReceiveFrameTransformerDelegate(
ReceiveFrameCallback receive_frame_callback,
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer,
TaskQueueBase* channel_receive_thread);
// Registers |this| as callback for |frame_transformer_|, to get the
// transformed frames.
void Init();
// Unregisters and releases the |frame_transformer_| reference, and resets
// |receive_frame_callback_| on |channel_receive_thread_|. Called from
// ChannelReceive destructor to prevent running the callback on a dangling
// channel.
void Reset();
// Delegates the call to FrameTransformerInterface::Transform, to transform
// the frame asynchronously.
void Transform(rtc::ArrayView<const uint8_t> packet,
const RTPHeader& header,
uint32_t ssrc);
// Implements TransformedFrameCallback. Can be called on any thread.
void OnTransformedFrame(
std::unique_ptr<TransformableFrameInterface> frame) override;
// Delegates the call to ChannelReceive::OnReceivedPayloadData on the
// |channel_receive_thread_|, by calling |receive_frame_callback_|.
void ReceiveFrame(std::unique_ptr<TransformableFrameInterface> frame) const;
protected:
~ChannelReceiveFrameTransformerDelegate() override = default;
private:
RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;
ReceiveFrameCallback receive_frame_callback_
RTC_GUARDED_BY(sequence_checker_);
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer_
RTC_GUARDED_BY(sequence_checker_);
TaskQueueBase* const channel_receive_thread_;
};
} // namespace webrtc
#endif // AUDIO_CHANNEL_RECEIVE_FRAME_TRANSFORMER_DELEGATE_H_
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