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/*
* Copyright (c) 2021 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_VIDEO_RTP_VIDEO_FRAME_ASSEMBLER_H_
#define API_VIDEO_RTP_VIDEO_FRAME_ASSEMBLER_H_
#include <cstdint>
#include <memory>
#include <utility>
#include "absl/container/inlined_vector.h"
#include "api/video/encoded_frame.h"
#include "modules/rtp_rtcp/source/rtp_packet_received.h"
namespace webrtc {
// The RtpVideoFrameAssembler takes RtpPacketReceived and assembles them into
// complete frames. A frame is considered complete when all packets of the frame
// has been received, the bitstream data has successfully extracted, an ID has
// been assigned, and all dependencies are known. Frame IDs are strictly
// monotonic in decode order, dependencies are expressed as frame IDs.
class RtpVideoFrameAssembler {
public:
// The RtpVideoFrameAssembler should return "RTP frames", but for now there
// is no good class for this purpose. For now return an EncodedFrame bundled
// with some minimal RTP information.
class AssembledFrame {
public:
AssembledFrame(uint16_t rtp_seq_num_start,
uint16_t rtp_seq_num_end,
std::unique_ptr<EncodedFrame> frame)
: rtp_seq_num_start_(rtp_seq_num_start),
rtp_seq_num_end_(rtp_seq_num_end),
frame_(std::move(frame)) {}
uint16_t RtpSeqNumStart() const { return rtp_seq_num_start_; }
uint16_t RtpSeqNumEnd() const { return rtp_seq_num_end_; }
std::unique_ptr<EncodedFrame> ExtractFrame() { return std::move(frame_); }
private:
uint16_t rtp_seq_num_start_;
uint16_t rtp_seq_num_end_;
std::unique_ptr<EncodedFrame> frame_;
};
// FrameVector is just a vector-like type of std::unique_ptr<EncodedFrame>.
// The vector type may change without notice.
using FrameVector = absl::InlinedVector<AssembledFrame, 3>;
enum PayloadFormat { kRaw, kH264, kVp8, kVp9, kAv1, kGeneric };
explicit RtpVideoFrameAssembler(PayloadFormat payload_format);
RtpVideoFrameAssembler(const RtpVideoFrameAssembler& other) = delete;
RtpVideoFrameAssembler& operator=(const RtpVideoFrameAssembler& other) =
delete;
~RtpVideoFrameAssembler();
// Typically when a packet is inserted zero or one frame is completed. In the
// case of RTP packets being inserted out of order then sometime multiple
// frames could be completed from a single packet, hence the 'FrameVector'
// return type.
FrameVector InsertPacket(const RtpPacketReceived& packet);
private:
class Impl;
std::unique_ptr<Impl> impl_;
};
} // namespace webrtc
#endif // API_VIDEO_RTP_VIDEO_FRAME_ASSEMBLER_H_
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