blob: 9b7eb33b5c5622947a689e20502126ac69b2bb16 [file] [log] [blame]
* 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.
#include <memory>
#include "api/frame_transformer_interface.h"
#include "api/sequence_checker.h"
#include "modules/audio_coding/include/audio_coding_module_typedefs.h"
#include "rtc_base/buffer.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/task_queue.h"
namespace webrtc {
// Delegates calls to FrameTransformerInterface to transform frames, and to
// ChannelSend to send the transformed frames using |send_frame_callback_| on
// the |encoder_queue_|.
// OnTransformedFrame() can be called from any thread, the delegate ensures
// thread-safe access to the ChannelSend callback.
class ChannelSendFrameTransformerDelegate : public TransformedFrameCallback {
using SendFrameCallback =
std::function<int32_t(AudioFrameType frameType,
uint8_t payloadType,
uint32_t rtp_timestamp,
rtc::ArrayView<const uint8_t> payload,
int64_t absolute_capture_timestamp_ms)>;
SendFrameCallback send_frame_callback,
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer,
rtc::TaskQueue* encoder_queue);
// Registers |this| as callback for |frame_transformer_|, to get the
// transformed frames.
void Init();
// Unregisters and releases the |frame_transformer_| reference, and resets
// |send_frame_callback_| under lock. Called from ChannelSend destructor to
// prevent running the callback on a dangling channel.
void Reset();
// Delegates the call to FrameTransformerInterface::TransformFrame, to
// transform the frame asynchronously.
void Transform(AudioFrameType frame_type,
uint8_t payload_type,
uint32_t rtp_timestamp,
uint32_t rtp_start_timestamp,
const uint8_t* payload_data,
size_t payload_size,
int64_t absolute_capture_timestamp_ms,
uint32_t ssrc);
// Implements TransformedFrameCallback. Can be called on any thread.
void OnTransformedFrame(
std::unique_ptr<TransformableFrameInterface> frame) override;
// Delegates the call to ChannelSend::SendRtpAudio on the |encoder_queue_|,
// by calling |send_audio_callback_|.
void SendFrame(std::unique_ptr<TransformableFrameInterface> frame) const;
~ChannelSendFrameTransformerDelegate() override = default;
mutable Mutex send_lock_;
SendFrameCallback send_frame_callback_ RTC_GUARDED_BY(send_lock_);
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer_;
rtc::TaskQueue* encoder_queue_ RTC_GUARDED_BY(send_lock_);
} // namespace webrtc