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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 <string>
#include "api/frame_transformer_interface.h"
#include "api/rtp_headers.h"
#include "api/sequence_checker.h"
#include "api/task_queue/task_queue_base.h"
#include "api/units/timestamp.h"
#include "rtc_base/system/no_unique_address.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(webrtc::ArrayView<const uint8_t> packet,
const RTPHeader& header,
Timestamp receive_time)>;
ChannelReceiveFrameTransformerDelegate(
ReceiveFrameCallback receive_frame_callback,
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(ArrayView<const uint8_t> packet,
const RTPHeader& header,
uint32_t ssrc,
const std::string& codec_mime_type,
Timestamp receive_time);
// Implements TransformedFrameCallback. Can be called on any thread.
void OnTransformedFrame(
std::unique_ptr<TransformableFrameInterface> frame) override;
void StartShortCircuiting() 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;
scoped_refptr<FrameTransformerInterface> FrameTransformer();
protected:
~ChannelReceiveFrameTransformerDelegate() override = default;
private:
RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;
ReceiveFrameCallback receive_frame_callback_
RTC_GUARDED_BY(sequence_checker_);
scoped_refptr<FrameTransformerInterface> frame_transformer_
RTC_GUARDED_BY(sequence_checker_);
TaskQueueBase* const channel_receive_thread_;
bool short_circuit_ RTC_GUARDED_BY(sequence_checker_) = false;
};
std::unique_ptr<TransformableAudioFrameInterface> CloneReceiverAudioFrame(
TransformableAudioFrameInterface* original);
} // namespace webrtc
#endif // AUDIO_CHANNEL_RECEIVE_FRAME_TRANSFORMER_DELEGATE_H_
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