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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 MODULES_VIDEO_CODING_H26X_PACKET_BUFFER_H_
#define MODULES_VIDEO_CODING_H26X_PACKET_BUFFER_H_
#include <array>
#include <cstddef>
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "absl/base/attributes.h"
#include "modules/video_coding/packet_buffer.h"
namespace webrtc {
class H26xPacketBuffer {
public:
// The H26xPacketBuffer does the same job as the PacketBuffer but for H264 and
// H265 only. To make it fit in with surronding code the PacketBuffer
// input/output classes are used.
using Packet = video_coding::PacketBuffer::Packet;
using InsertResult = video_coding::PacketBuffer::InsertResult;
// |h264_idr_only_keyframes_allowed| is ignored if H.265 is used.
explicit H26xPacketBuffer(bool h264_idr_only_keyframes_allowed);
ABSL_MUST_USE_RESULT InsertResult
InsertPacket(std::unique_ptr<Packet> packet);
ABSL_MUST_USE_RESULT InsertResult InsertPadding(uint16_t unwrapped_seq_num);
// Out of band supplied codec parameters for H.264.
void SetSpropParameterSets(const std::string& sprop_parameter_sets);
private:
// Stores PPS payload and the active SPS ID.
struct PpsInfo {
PpsInfo() = default;
PpsInfo(PpsInfo&& rhs) = default;
PpsInfo& operator=(PpsInfo&& rhs) = default;
~PpsInfo() = default;
// The value of sps_seq_parameter_set_id for the active SPS.
uint32_t sps_id = 0;
// Payload size.
size_t size = 0;
std::unique_ptr<uint8_t[]> payload;
};
// Stores SPS payload and picture size.
struct SpsInfo {
SpsInfo() = default;
SpsInfo(SpsInfo&& rhs) = default;
SpsInfo& operator=(SpsInfo&& rhs) = default;
~SpsInfo() = default;
// The width and height of decoded pictures.
int width = -1;
int height = -1;
// Payload size.
size_t size = 0;
std::unique_ptr<uint8_t[]> payload;
};
static constexpr int kBufferSize = 2048;
static constexpr int kNumTrackedSequences = 5;
std::unique_ptr<Packet>& GetPacket(int64_t unwrapped_seq_num);
bool BeginningOfStream(const Packet& packet) const;
InsertResult FindFrames(int64_t unwrapped_seq_num);
bool MaybeAssembleFrame(int64_t start_seq_num_unwrapped,
int64_t end_sequence_number_unwrapped,
InsertResult& result);
// Store SPS and PPS nalus. They will be used later when an IDR frame is
// received without SPS/PPS.
void InsertSpsPpsNalus(const std::vector<uint8_t>& sps,
const std::vector<uint8_t>& pps);
// Insert start code and paramter sets for H.264 payload, also update header
// if parameter sets are inserted. Return false if required SPS or PPS is not
// found.
bool FixH264Packet(Packet& packet);
// Indicates whether IDR frames without SPS and PPS are allowed.
const bool h264_idr_only_keyframes_allowed_;
std::array<std::unique_ptr<Packet>, kBufferSize> buffer_;
std::array<int64_t, kNumTrackedSequences> last_continuous_in_sequence_;
int64_t last_continuous_in_sequence_index_ = 0;
// Map from pps_pic_parameter_set_id to the PPS payload associated with this
// ID.
std::map<int, PpsInfo> pps_data_;
// Map from sps_video_parameter_set_id to the SPS payload associated with this
// ID.
std::map<int, SpsInfo> sps_data_;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_H26X_PACKET_BUFFER_H_
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