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

/*
 *  Copyright (c) 2018 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/rtp_generic_frame_descriptor_extension.h"

#include "rtc_base/checks.h"

namespace webrtc {
namespace {

constexpr uint8_t kFlagBeginOfSubframe = …;
constexpr uint8_t kFlagEndOfSubframe = …;

// In version 00, the flags F and L in the first byte correspond to
// kFlagFirstSubframeV00 and kFlagLastSubframeV00. In practice, they were
// always set to `true`.
constexpr uint8_t kFlagFirstSubframeV00 = …;
constexpr uint8_t kFlagLastSubframeV00 = …;

constexpr uint8_t kFlagDependencies = …;
constexpr uint8_t kMaskTemporalLayer = …;

constexpr uint8_t kFlagMoreDependencies = …;
constexpr uint8_t kFlageXtendedOffset = …;
}  // namespace
//       0 1 2 3 4 5 6 7
//      +-+-+-+-+-+-+-+-+
//      |B|E|F|L|D|  T  |
//      +-+-+-+-+-+-+-+-+
// B:   |       S       |
//      +-+-+-+-+-+-+-+-+
//      |               |
// B:   +      FID      +
//      |               |
//      +-+-+-+-+-+-+-+-+
//      |               |
//      +     Width     +
// B=1  |               |
// and  +-+-+-+-+-+-+-+-+
// D=0  |               |
//      +     Height    +
//      |               |
//      +-+-+-+-+-+-+-+-+
// D:   |    FDIFF  |X|M|
//      +---------------+
// X:   |      ...      |
//      +-+-+-+-+-+-+-+-+
// M:   |    FDIFF  |X|M|
//      +---------------+
//      |      ...      |
//      +-+-+-+-+-+-+-+-+
constexpr RTPExtensionType RtpGenericFrameDescriptorExtension00::kId;

bool RtpGenericFrameDescriptorExtension00::Parse(
    rtc::ArrayView<const uint8_t> data,
    RtpGenericFrameDescriptor* descriptor) { … }

size_t RtpGenericFrameDescriptorExtension00::ValueSize(
    const RtpGenericFrameDescriptor& descriptor) { … }

bool RtpGenericFrameDescriptorExtension00::Write(
    rtc::ArrayView<uint8_t> data,
    const RtpGenericFrameDescriptor& descriptor) { … }

}  // namespace webrtc