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/*
* Copyright 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 API_FRAME_TRANSFORMER_INTERFACE_H_
#define API_FRAME_TRANSFORMER_INTERFACE_H_
#include <memory>
#include <vector>
#include "api/scoped_refptr.h"
#include "api/video/encoded_frame.h"
#include "api/video/video_frame_metadata.h"
#include "rtc_base/ref_count.h"
namespace webrtc {
// Owns the frame payload data.
class TransformableFrameInterface {
public:
virtual ~TransformableFrameInterface() = default;
// Returns the frame payload data. The data is valid until the next non-const
// method call.
virtual rtc::ArrayView<const uint8_t> GetData() const = 0;
// Copies `data` into the owned frame payload data.
virtual void SetData(rtc::ArrayView<const uint8_t> data) = 0;
virtual uint8_t GetPayloadType() const = 0;
virtual uint32_t GetSsrc() const = 0;
virtual uint32_t GetTimestamp() const = 0;
enum class Direction {
kUnknown,
kReceiver,
kSender,
};
// TODO(crbug.com/1250638): Remove this distinction between receiver and
// sender frames to allow received frames to be directly re-transmitted on
// other PeerConnectionss.
virtual Direction GetDirection() const { return Direction::kUnknown; }
};
class TransformableVideoFrameInterface : public TransformableFrameInterface {
public:
virtual ~TransformableVideoFrameInterface() = default;
virtual bool IsKeyFrame() const = 0;
// Returns data needed in the frame transformation logic; for example,
// when the transformation applied to the frame is encryption/decryption, the
// additional data holds the serialized generic frame descriptor extension
// calculated in webrtc::RtpDescriptorAuthentication.
// TODO(bugs.webrtc.org/11380) remove from interface once
// webrtc::RtpDescriptorAuthentication is exposed in api/.
virtual std::vector<uint8_t> GetAdditionalData() const = 0;
virtual const VideoFrameMetadata& GetMetadata() const = 0;
// TODO(https://crbug.com/webrtc/14709): Make pure virtual when Chromium MOCK
// has implemented this.
virtual void SetMetadata(const VideoFrameMetadata&) {}
};
// Extends the TransformableFrameInterface to expose audio-specific information.
class TransformableAudioFrameInterface : public TransformableFrameInterface {
public:
virtual ~TransformableAudioFrameInterface() = default;
// Exposes the frame header, enabling the interface clients to use the
// information in the header as needed, for example to compile the list of
// csrcs.
virtual const RTPHeader& GetHeader() const = 0;
virtual rtc::ArrayView<const uint32_t> GetContributingSources() const = 0;
};
// Objects implement this interface to be notified with the transformed frame.
class TransformedFrameCallback : public rtc::RefCountInterface {
public:
virtual void OnTransformedFrame(
std::unique_ptr<TransformableFrameInterface> frame) = 0;
protected:
~TransformedFrameCallback() override = default;
};
// Transforms encoded frames. The transformed frame is sent in a callback using
// the TransformedFrameCallback interface (see above).
class FrameTransformerInterface : public rtc::RefCountInterface {
public:
// Transforms `frame` using the implementing class' processing logic.
virtual void Transform(
std::unique_ptr<TransformableFrameInterface> transformable_frame) = 0;
virtual void RegisterTransformedFrameCallback(
rtc::scoped_refptr<TransformedFrameCallback>) {}
virtual void RegisterTransformedFrameSinkCallback(
rtc::scoped_refptr<TransformedFrameCallback>,
uint32_t ssrc) {}
virtual void UnregisterTransformedFrameCallback() {}
virtual void UnregisterTransformedFrameSinkCallback(uint32_t ssrc) {}
protected:
~FrameTransformerInterface() override = default;
};
} // namespace webrtc
#endif // API_FRAME_TRANSFORMER_INTERFACE_H_
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