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Introduce InbandComfortNoise RTP header extension.

Browse Source 
BUG: webrtc:11085
Change-Id: I9b556a0d67d3c239abc247787103af9e50af4e65
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/159710
Commit-Queue: Minyue Li <minyue@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30014}
This commit is contained in:
Minyue Li
2019-11-29 16:18:59 +01:00
committed by Commit Bot
parent 78782a806f
commit cae277959b
7 changed files with 76 additions and 1 deletions
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45
modules/rtp_rtcp/source/rtp_header_extensions.cc
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@ -855,4 +855,49 @@ constexpr const char RepairedRtpStreamId::kUri[];
constexpr RTPExtensionType RtpMid::kId;
constexpr const char RtpMid::kUri[];
// An RTP Header Extension for Inband Comfort Noise
//
// 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 |N| 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 |N| level |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// Sample Audio Level Encoding Using the Two-Byte Header Format
constexpr RTPExtensionType InbandComfortNoiseExtension::kId;
constexpr uint8_t InbandComfortNoiseExtension::kValueSizeBytes;
constexpr const char InbandComfortNoiseExtension::kUri[];
bool InbandComfortNoiseExtension::Parse(rtc::ArrayView<const uint8_t> data,
absl::optional<uint8_t>* level) {
if (data.size() != kValueSizeBytes)
return false;
*level = (data[0] & 0b1000'0000) != 0
? absl::nullopt
: absl::make_optional(data[0] & 0b0111'1111);
return true;
}
bool InbandComfortNoiseExtension::Write(rtc::ArrayView<uint8_t> data,
absl::optional<uint8_t> level) {
RTC_DCHECK_EQ(data.size(), kValueSizeBytes);
data[0] = 0b0000'0000;
if (level) {
if (*level > 127) {
return false;
}
data[0] = 0b1000'0000 | *level;
}
return true;
}
} // namespace webrtc