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913cfa76ec
Bug: webrtc:12338 Change-Id: I52eb3b6675c4705e22f51b70799ed6139a3b46bc Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227164 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34686}
89 lines
3.1 KiB
C++
89 lines
3.1 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_WRITER_H_
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#define MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_WRITER_H_
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#include <bitset>
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#include <cstddef>
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#include <cstdint>
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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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class RtpDependencyDescriptorWriter {
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public:
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// Assumes `structure` and `descriptor` are valid and
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// `descriptor` matches the `structure`.
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RtpDependencyDescriptorWriter(rtc::ArrayView<uint8_t> data,
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const FrameDependencyStructure& structure,
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std::bitset<32> active_chains,
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const DependencyDescriptor& descriptor);
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// Serializes DependencyDescriptor rtp header extension.
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// Returns false if `data` is too small to serialize the `descriptor`.
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bool Write();
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// Returns minimum number of bits needed to serialize descriptor with respect
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// to the `structure`. Returns 0 if `descriptor` can't be serialized.
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int ValueSizeBits() const;
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private:
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// Used both as pointer to the template and as index in the templates vector.
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using TemplateIterator = std::vector<FrameDependencyTemplate>::const_iterator;
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struct TemplateMatch {
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TemplateIterator template_position;
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bool need_custom_dtis;
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bool need_custom_fdiffs;
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bool need_custom_chains;
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// Size in bits to store frame-specific details, i.e.
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// excluding mandatory fields and template dependency structure.
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int extra_size_bits;
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};
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int StructureSizeBits() const;
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TemplateMatch CalculateMatch(TemplateIterator frame_template) const;
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void FindBestTemplate();
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bool ShouldWriteActiveDecodeTargetsBitmask() const;
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bool HasExtendedFields() const;
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uint64_t TemplateId() const;
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void WriteBits(uint64_t val, size_t bit_count);
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void WriteNonSymmetric(uint32_t value, uint32_t num_values);
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// Functions to read template dependency structure.
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void WriteTemplateDependencyStructure();
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void WriteTemplateLayers();
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void WriteTemplateDtis();
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void WriteTemplateFdiffs();
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void WriteTemplateChains();
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void WriteResolutions();
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// Function to read details for the current frame.
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void WriteMandatoryFields();
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void WriteExtendedFields();
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void WriteFrameDependencyDefinition();
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void WriteFrameDtis();
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void WriteFrameFdiffs();
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void WriteFrameChains();
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bool build_failed_ = false;
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const DependencyDescriptor& descriptor_;
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const FrameDependencyStructure& structure_;
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std::bitset<32> active_chains_;
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rtc::BitBufferWriter bit_writer_;
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TemplateMatch best_template_;
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};
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} // namespace webrtc
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#endif // MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_WRITER_H_
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