chromium/third_party/webrtc/modules/rtp_rtcp/source/video_rtp_depacketizer_vp8.cc

/*
 *  Copyright (c) 2019 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.
 */

#include "modules/rtp_rtcp/source/video_rtp_depacketizer_vp8.h"

#include <stddef.h>
#include <stdint.h>

#include "absl/types/optional.h"
#include "api/array_view.h"
#include "modules/rtp_rtcp/source/rtp_video_header.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"

// VP8 payload descriptor
// https://datatracker.ietf.org/doc/html/rfc7741#section-4.2
//
//       0 1 2 3 4 5 6 7
//      +-+-+-+-+-+-+-+-+
//      |X|R|N|S|R| PID | (REQUIRED)
//      +-+-+-+-+-+-+-+-+
// X:   |I|L|T|K| RSV   | (OPTIONAL)
//      +-+-+-+-+-+-+-+-+
// I:   |M| PictureID   | (OPTIONAL)
//      +-+-+-+-+-+-+-+-+
//      |   PictureID   |
//      +-+-+-+-+-+-+-+-+
// L:   |   TL0PICIDX   | (OPTIONAL)
//      +-+-+-+-+-+-+-+-+
// T/K: |TID|Y| KEYIDX  | (OPTIONAL)
//      +-+-+-+-+-+-+-+-+
//
// VP8 payload header. Considered part of the actual payload, sent to decoder.
// https://datatracker.ietf.org/doc/html/rfc7741#section-4.3
//
//       0 1 2 3 4 5 6 7
//      +-+-+-+-+-+-+-+-+
//      |Size0|H| VER |P|
//      +-+-+-+-+-+-+-+-+
//      :      ...      :
//      +-+-+-+-+-+-+-+-+

namespace webrtc {
namespace {

constexpr int kFailedToParse = …;

int ParseVP8Descriptor(RTPVideoHeaderVP8* vp8,
                       const uint8_t* data,
                       size_t data_length) { … }

}  // namespace

absl::optional<VideoRtpDepacketizer::ParsedRtpPayload>
VideoRtpDepacketizerVp8::Parse(rtc::CopyOnWriteBuffer rtp_payload) { … }

int VideoRtpDepacketizerVp8::ParseRtpPayload(
    rtc::ArrayView<const uint8_t> rtp_payload,
    RTPVideoHeader* video_header) { … }

}  // namespace webrtc