abadbce1fa
Follow H.265 spec section 7.4.2.4.4 to set is_first_packet_in_frame flag in rtp header, to make sure we only set it to true when corresponding NALU can be the first NALU in a frame. Bug: chromium:384391181 Change-Id: I082c38513d9d213f8d354633539028b57777368f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/372742 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43651}
132 lines
4.2 KiB
C++
132 lines
4.2 KiB
C++
/*
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* Copyright (c) 2023 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 COMMON_VIDEO_H265_H265_COMMON_H_
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#define COMMON_VIDEO_H265_H265_COMMON_H_
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#include <memory>
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#include <vector>
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#include "common_video/h265/h265_inline.h"
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#include "rtc_base/buffer.h"
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#include "rtc_base/system/rtc_export.h"
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namespace webrtc {
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namespace H265 {
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// The size of a full NALU start sequence {0 0 0 1}, used for the first NALU
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// of an access unit, and for SPS and PPS blocks.
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constexpr size_t kNaluLongStartSequenceSize = 4;
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// The size of a shortened NALU start sequence {0 0 1}, that may be used if
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// not the first NALU of an access unit or an SPS or PPS block.
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constexpr size_t kNaluShortStartSequenceSize = 3;
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// The size of the NALU header byte (2).
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constexpr size_t kNaluHeaderSize = 2;
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// Type description of 0-40 is defined in Table7-1 of the H.265 spec
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// Type desciption of 48-49 is defined in section 4.4.2 and 4.4.3 of RFC7798
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enum NaluType : uint8_t {
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kTrailN = 0,
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kTrailR = 1,
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kTsaN = 2,
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kTsaR = 3,
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kStsaN = 4,
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kStsaR = 5,
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kRadlN = 6,
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kRadlR = 7,
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kBlaWLp = 16,
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kBlaWRadl = 17,
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kBlaNLp = 18,
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kIdrWRadl = 19,
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kIdrNLp = 20,
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kCra = 21,
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kRsvIrapVcl23 = 23,
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kRsvVcl31 = 31,
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kVps = 32,
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kSps = 33,
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kPps = 34,
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kAud = 35,
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kPrefixSei = 39,
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kSuffixSei = 40,
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// Aggregation packets, refer to section 4.4.2 in RFC 7798.
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kAp = 48,
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// Fragmentation units, refer to section 4.4.3 in RFC 7798.
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kFu = 49,
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// PACI packets, refer to section 4.4.4 in RFC 7798.
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kPaci = 50
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};
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// Slice type definition. See table 7-7 of the H.265 spec
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enum SliceType : uint8_t { kB = 0, kP = 1, kI = 2 };
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struct NaluIndex {
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// Start index of NALU, including start sequence.
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size_t start_offset = 0;
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// Start index of NALU payload, typically type header.
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size_t payload_start_offset = 0;
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// Length of NALU payload, in bytes, counting from payload_start_offset.
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size_t payload_size = 0;
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};
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// Returns a vector of the NALU indices in the given buffer.
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RTC_EXPORT std::vector<NaluIndex> FindNaluIndices(
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rtc::ArrayView<const uint8_t> buffer);
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// TODO: bugs.webrtc.org/42225170 - Deprecate.
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inline std::vector<NaluIndex> FindNaluIndices(const uint8_t* buffer,
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size_t buffer_size) {
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return FindNaluIndices(rtc::MakeArrayView(buffer, buffer_size));
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}
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// Get the NAL type from the header byte immediately following start sequence.
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RTC_EXPORT NaluType ParseNaluType(uint8_t data);
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// Methods for parsing and writing RBSP. See section 7.4.2 of the H.265 spec.
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//
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// The following sequences are illegal, and need to be escaped when encoding:
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// 00 00 00 -> 00 00 03 00
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// 00 00 01 -> 00 00 03 01
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// 00 00 02 -> 00 00 03 02
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// And things in the source that look like the emulation byte pattern (00 00 03)
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// need to have an extra emulation byte added, so it's removed when decoding:
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// 00 00 03 -> 00 00 03 03
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//
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// Decoding is simply a matter of finding any 00 00 03 sequence and removing
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// the 03 emulation byte.
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// Parse the given data and remove any emulation byte escaping.
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std::vector<uint8_t> ParseRbsp(rtc::ArrayView<const uint8_t> data);
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// TODO: bugs.webrtc.org/42225170 - Deprecate.
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inline std::vector<uint8_t> ParseRbsp(const uint8_t* data, size_t length) {
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return ParseRbsp(rtc::MakeArrayView(data, length));
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}
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// Write the given data to the destination buffer, inserting and emulation
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// bytes in order to escape any data the could be interpreted as a start
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// sequence.
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void WriteRbsp(rtc::ArrayView<const uint8_t> bytes, rtc::Buffer* destination);
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// TODO: bugs.webrtc.org/42225170 - Deprecate.
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inline void WriteRbsp(const uint8_t* bytes,
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size_t length,
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rtc::Buffer* destination) {
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WriteRbsp(rtc::MakeArrayView(bytes, length), destination);
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}
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uint32_t Log2Ceiling(uint32_t value);
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} // namespace H265
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} // namespace webrtc
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#endif // COMMON_VIDEO_H265_H265_COMMON_H_
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