8037fc6ffa
Bug: webrtc:342905193 No-Try: True Change-Id: Icc968be43b8830038ea9a1f5f604307220457807 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/361021 Auto-Submit: Florent Castelli <orphis@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42911}
52 lines
1.5 KiB
C++
52 lines
1.5 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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#include "common_video/h265/h265_vps_parser.h"
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#include "common_video/h265/h265_common.h"
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#include "rtc_base/bit_buffer.h"
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#include "rtc_base/bitstream_reader.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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H265VpsParser::VpsState::VpsState() = default;
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// General note: this is based off the 08/2021 version of the H.265 standard.
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// You can find it on this page:
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// http://www.itu.int/rec/T-REC-H.265
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// Unpack RBSP and parse VPS state from the supplied buffer.
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std::optional<H265VpsParser::VpsState> H265VpsParser::ParseVps(
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rtc::ArrayView<const uint8_t> data) {
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return ParseInternal(H265::ParseRbsp(data));
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}
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std::optional<H265VpsParser::VpsState> H265VpsParser::ParseInternal(
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rtc::ArrayView<const uint8_t> buffer) {
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BitstreamReader reader(buffer);
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// Now, we need to use a bit buffer to parse through the actual H265 VPS
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// format. See Section 7.3.2.1 ("Video parameter set RBSP syntax") of the
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// H.265 standard for a complete description.
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VpsState vps;
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// vps_video_parameter_set_id: u(4)
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vps.id = reader.ReadBits(4);
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if (!reader.Ok()) {
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return std::nullopt;
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}
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return vps;
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}
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} // namespace webrtc
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