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The extension (and thus structures to carry it) are designed in particular for client<->SFU link. Putting the structure into api acknowledges it can be reused by SFU projects Bug: webrtc:10342 Change-Id: I8ca1f5046abadf6aa16200443c4892e9a2a928b4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/166467 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30324}
75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_READER_H_
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#define MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_READER_H_
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#include <cstdint>
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#include <memory>
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#include <vector>
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#include "api/array_view.h"
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#include "api/transport/rtp/dependency_descriptor.h"
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#include "rtc_base/bit_buffer.h"
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namespace webrtc {
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// Deserializes DependencyDescriptor rtp header extension.
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class RtpDependencyDescriptorReader {
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public:
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// Parses the dependency descriptor.
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RtpDependencyDescriptorReader(rtc::ArrayView<const uint8_t> raw_data,
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const FrameDependencyStructure* structure,
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DependencyDescriptor* descriptor);
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RtpDependencyDescriptorReader(const RtpDependencyDescriptorReader&) = delete;
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RtpDependencyDescriptorReader& operator=(
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const RtpDependencyDescriptorReader&) = delete;
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// Returns true if parse was successful.
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bool ParseSuccessful() { return !parsing_failed_; }
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private:
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// Reads bits from |buffer_|. If it fails, returns 0 and marks parsing as
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// failed, but doesn't stop the parsing.
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uint32_t ReadBits(size_t bit_count);
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uint32_t ReadNonSymmetric(size_t num_values);
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// Functions to read template dependency structure.
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void ReadTemplateDependencyStructure();
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void ReadTemplateLayers();
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void ReadTemplateDtis();
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void ReadTemplateFdiffs();
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void ReadTemplateChains();
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void ReadResolutions();
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// Function to read details for the current frame.
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void ReadMandatoryFields();
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void ReadExtendedFields();
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void ReadFrameDependencyDefinition();
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void ReadFrameDtis();
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void ReadFrameFdiffs();
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void ReadFrameChains();
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// Output.
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bool parsing_failed_ = false;
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DependencyDescriptor* const descriptor_;
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// Values that are needed while reading the descriptor, but can be discarded
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// when reading is complete.
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rtc::BitBuffer buffer_;
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int frame_dependency_template_id_ = 0;
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bool active_decode_targets_present_flag_ = false;
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bool custom_dtis_flag_ = false;
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bool custom_fdiffs_flag_ = false;
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bool custom_chains_flag_ = false;
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const FrameDependencyStructure* structure_ = nullptr;
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};
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} // namespace webrtc
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#endif // MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_READER_H_
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