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Update comments on Audio Level RTP header extension.

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Bug: None
Change-Id: Id9f10ea2236ba4a154cd82f2e2b05e3fa03442f3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158745
Commit-Queue: Minyue Li <minyue@webrtc.org>
Reviewed-by: Johannes Kron <kron@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29666}
This commit is contained in:
Minyue Li
2019-10-31 10:59:18 +01:00
committed by Commit Bot
parent 577c580cd0
commit d1ea4c93d3
1 changed files with 16 additions and 6 deletions
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22
modules/rtp_rtcp/source/rtp_header_extensions.cc
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@ -143,16 +143,24 @@ bool AbsoluteCaptureTimeExtension::Write(rtc::ArrayView<uint8_t> data,
// An RTP Header Extension for Client-to-Mixer Audio Level Indication
//
// https://datatracker.ietf.org/doc/draft-lennox-avt-rtp-audio-level-exthdr/
// https://tools.ietf.org/html/rfc6464
//
// The form of the audio level extension block:
//
// 0 1
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | ID | len=0 |V| level |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// 0 1
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | ID | len=0 |V| level |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// Sample Audio Level Encoding Using the One-Byte Header Format
//
// 0 1 2
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | ID | len=1 |V| level |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// Sample Audio Level Encoding Using the Two-Byte Header Format
constexpr RTPExtensionType AudioLevel::kId;
constexpr uint8_t AudioLevel::kValueSizeBytes;
constexpr const char AudioLevel::kUri[];
@ -160,6 +168,7 @@ constexpr const char AudioLevel::kUri[];
bool AudioLevel::Parse(rtc::ArrayView<const uint8_t> data,
bool* voice_activity,
uint8_t* audio_level) {
// One-byte and two-byte format share the same data definition.
if (data.size() != 1)
return false;
*voice_activity = (data[0] & 0x80) != 0;
@ -170,6 +179,7 @@ bool AudioLevel::Parse(rtc::ArrayView<const uint8_t> data,
bool AudioLevel::Write(rtc::ArrayView<uint8_t> data,
bool voice_activity,
uint8_t audio_level) {
// One-byte and two-byte format share the same data definition.
RTC_DCHECK_EQ(data.size(), 1);
RTC_CHECK_LE(audio_level, 0x7f);
data[0] = (voice_activity ? 0x80 : 0x00) | audio_level;